[CentOS] LVM overhead? Does it cripple I/O?
For a high-performance system (64-cores, 512GB RAM, 5TB local disk, 110TB NFS-mounted storage) is there any advantage of dropping lvm and mounting partitions directly? We're not planning on changing partition sizes, but if we did we'd probably do a full rebuild. Has anyone done performance testing to show that lvm isn't crippling I/O? Thanx, Russell === Attention: The information contained in this message and/or attachments from AgResearch Limited is intended only for the persons or entities to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipients is prohibited by AgResearch Limited. If you have received this message in error, please notify the sender immediately. === ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] rsync question
As far as I can see timestamp and size is the default. I've turned off compression and I think I'm getting better throughput. Running 4 rsync tasks and getting sustained transfers for several hours of just over 800Mb/sec :- ) --Russell -Original Message- From: centos-boun...@centos.org [mailto:centos-boun...@centos.org] On Behalf Of John R Pierce Sent: Tuesday, 31 July 2012 5:16 p.m. To: centos@centos.org Subject: Re: [CentOS] rsync question On 07/30/12 10:05 PM, Smithies, Russell wrote: I'm trying to rsync a 8TB data folder containing squillions of small files and it's taking forever (i.e. weeks) to get anywhere. I'm assuming the slow bit is check-summing everything with a single CPU (even though it's on a 12-core server ;-( ) Is it possible to do something simple like scp the whole dir in one go so they're duplicates in the first instance, then get rsync to just keep them in sync without an initial transfer? use the rsync mode that goes off file timestamp and size. the checksuming block algorithm is only useful on large files that get small random block changes. -- john r pierceN 37, W 122 santa cruz ca mid-left coast ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos === Attention: The information contained in this message and/or attachments from AgResearch Limited is intended only for the persons or entities to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipients is prohibited by AgResearch Limited. If you have received this message in error, please notify the sender immediately. === ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS] rsync question
I'm trying to rsync a 8TB data folder containing squillions of small files and it's taking forever (i.e. weeks) to get anywhere. I'm assuming the slow bit is check-summing everything with a single CPU (even though it's on a 12-core server ;-( ) Is it possible to do something simple like scp the whole dir in one go so they're duplicates in the first instance, then get rsync to just keep them in sync without an initial transfer? Or is there a better way? Thanx, Russell Smithies Infrastructure Technician T 03 489 9085 M 027 4734 600 E russell.smith...@agresearch.co.nz Invermay Agricultural Centre Puddle Alley, Private Bag 50034, Mosgiel 9053, New Zealand T +64 3 489 3809 F +64 3 489 3739 www.agresearch.co.nzhttp://www.agresearch.co.nz/ === Attention: The information contained in this message and/or attachments from AgResearch Limited is intended only for the persons or entities to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipients is prohibited by AgResearch Limited. If you have received this message in error, please notify the sender immediately. === ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Best way to duplicate a live Centos 5 server?
How about using one of the backup tools to image the server? We use Symantec System Recovery and image all the disks. We then have the option of restoring to different hardware (physical or virtual) which works very well. There's a 60-day evaluation period. http://www.symantec.com/products/trialware.jsp?pcid=pcat_business_contpvid=1602_1 --Russell -Original Message- From: centos-boun...@centos.org [mailto:centos-boun...@centos.org] On Behalf Of Emmanuel Noobadmin Sent: Thursday, 14 June 2012 2:36 a.m. To: CentOS mailing list Subject: Re: [CentOS] Best way to duplicate a live Centos 5 server? I'm using KVM so didn't have the tool. While Les' suggestion looked like it was going to be pretty useful for a variety of backup/restore situations, I didn't know if I had the time to go through the docs and get things working in time. So in the end I went with the repeated rSync method Scott mentioned. The advantage is, I also went and made the new system C6 first, then rsync the necessary data files instead of leaving it still on C5. Thankfully nothing broke, well, except SSL certs for some reason but that was easily fixed once people started complaining. On 6/13/12, Tris Hoar trish...@bgfl.org wrote: On 08/06/2012 17:33, Emmanuel Noobadmin wrote: I've got a CentOS 5 server that I want to migrate over into a virtualized instance. The problem is I need to minimize downtime so was trying to figure out a way to live clone the original. Initially, I thought I could do this via exporting an iSCSI target from the virtual host, create a MD raid 1 array on the C5 server, wait for it to sync, then shutdown the physical server and switch to the virtual one. But after getting iSCSI working... I realize I could not create a md device on a mounted disk. Unfortunately this old C5 wasn't setup with md raid 1 originally so I can't just add a the iSCSI target as an additional member for a triplicate. So I remembered DRBD was supposed to be used for replication. But after getting things set up, running the drbd-admin create-md command gave me this scary warning it will destroy data on the disk. Apparently because drbd writes meta data to the drive. So that appears to be a no go too. Am I missing something glaringly obvious here, or is the only way I'm going be able to migrate is to shutdown the C5 server for a few hours while duping the old drives? Would greatly appreciate any pointers how best to do this. You don't say what virtualisation platform you are using is, but if it's VMware, then you can use VMware converter to do the migration. This can, if you want, clone the physical computer into VMware, shut down the physical computer and bring up the new virtual instance. All whilst the physical remained up. I've used it for a few Linux boxes, where I've wanted a quick dev version of an existing server and its been fine. I guess, you could try pulling it into an ESXi host, and then exporting that in a format whatever virtualisation program it is you use supports... Regards, Tris * This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify postmas...@bgfl.org The views expressed within this email are those of the individual, and not necessarily those of the organisation * ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos === Attention: The information contained in this message and/or attachments from AgResearch Limited is intended only for the persons or entities to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipients is prohibited by AgResearch Limited. If you have received this message in error, please notify the sender immediately. === ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS] windbind and AD authentication - UPPER CASE usernames?
We're looking at using windbind and AD for our user account details but have run into a small snag. All user accounts in AD are upper case but our linux accounts are lower-case. Is there a simple solution we've overlooked? We really don't want to have to hack this... Thanx, Russell SMithies === Attention: The information contained in this message and/or attachments from AgResearch Limited is intended only for the persons or entities to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipients is prohibited by AgResearch Limited. If you have received this message in error, please notify the sender immediately. === ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] mount NFS share over specific nic?
I have 4 nics each on all the servers (DL385-G7 for FreeNAS and 4 x DL585-G7s) so dedicating a couple for NFS traffic on their own subnet is no problem. We may even go for 10gig on the nfs if the performance increase can be justified. --Russell -Original Message- From: centos-boun...@centos.org [mailto:centos-boun...@centos.org] On Behalf Of Les Mikesell Sent: Wednesday, 14 March 2012 5:28 p.m. To: CentOS mailing list Subject: Re: [CentOS] mount NFS share over specific nic? On Tue, Mar 13, 2012 at 10:42 PM, Smithies, Russell russell.smith...@agresearch.co.nz wrote: I suspected some subnetting would be involved but hoped I could get away with different IPs on the nics. Might have to get the networking books out, it's not my strong suit :-( If you look at network addresses and subnet masks in binary it is easy to see how routing decisions are made. But you don't need to do that, you can just use a subnet chart or stick to /24 ranges where the first 3 octets are different for different subnets and you netmask is 255.255.255.0.But first you need to decide what you want to do - will both the server and clients have separate NICs for NFS? That makes it easy - use a different range, hook them to a different switch and you are done. Bonus, you can restrict the sharing to that set of addresses for security - and maybe use jumbo frames. -- Les Mikesell lesmikes...@gmail.com ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos === Attention: The information contained in this message and/or attachments from AgResearch Limited is intended only for the persons or entities to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipients is prohibited by AgResearch Limited. If you have received this message in error, please notify the sender immediately. === ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS] mount NFS share over specific nic?
I have a new server with multiple nics running Centos 6.2 and I'd like to force all NFS traffic over one nic. We're using FreeNAS to dish out NFS shares and I have different IPs on my 2 nics but how can I get the server to mount the share over one particular nic? Or is there a better way to do it? Thanx, Russell Smithies === Attention: The information contained in this message and/or attachments from AgResearch Limited is intended only for the persons or entities to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipients is prohibited by AgResearch Limited. If you have received this message in error, please notify the sender immediately. === ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] mount NFS share over specific nic?
I suspected some subnetting would be involved but hoped I could get away with different IPs on the nics. Might have to get the networking books out, it's not my strong suit :-( --Russell -Original Message- From: centos-boun...@centos.org [mailto:centos-boun...@centos.org] On Behalf Of Les Mikesell Sent: Wednesday, 14 March 2012 4:30 p.m. To: CentOS mailing list Subject: Re: [CentOS] mount NFS share over specific nic? On Tue, Mar 13, 2012 at 10:15 PM, Fajar Priyanto fajar...@arinet.org wrote: On Wed, Mar 14, 2012 at 9:29 AM, Smithies, Russell russell.smith...@agresearch.co.nz wrote: I have a new server with multiple nics running Centos 6.2 and I'd like to force all NFS traffic over one nic. We're using FreeNAS to dish out NFS shares and I have different IPs on my 2 nics but how can I get the server to mount the share over one particular nic? Or is there a better way to do it? You can force it from the server, you do it from the client. Just tell the client to mount the NFS from the IP you want. :) That's assuming you have a normal network topology where each NIC is on a separate subnet with appropriate routes controlling which way other destinations will head. From the question, I'm not sure that is the case here. -- Les Mikesell lesmikes...@gmail.com ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos === Attention: The information contained in this message and/or attachments from AgResearch Limited is intended only for the persons or entities to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipients is prohibited by AgResearch Limited. If you have received this message in error, please notify the sender immediately. === ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Using an MS Access database from CentOS release 5.7 (Final)
Try the Sybase driver. I can connect Perl to Microsoft SQL Server using Sybase drivers it so might work with Access. Parts of this might be useful: http://www.peceny.de/misc/freetds.html --Russell -Original Message- From: centos-boun...@centos.org [mailto:centos-boun...@centos.org] On Behalf Of Les Mikesell Sent: Thursday, 15 December 2011 10:58 a.m. To: CentOS mailing list Subject: Re: [CentOS] Using an MS Access database from CentOS release 5.7 (Final) On Wed, Dec 14, 2011 at 3:21 PM, Ron Young ronyo...@nc.rr.com wrote: @Work requires me to manipulate the MS Access database (mdb) file located on an XP box that is an integral part of a third party application that is central to the business. Does anyone have experience doing so? I have used odbtp in the recent past but it is extremely difficult to set up on the linux box as I learned when I recently upgraded from CentOS 4.x to 5.x. Is there another way to get read and write access to the mdb file from apache/php running from the linux box? A couple of hours of googling last night has resulted in finding very expensive odbc drivers for the linux box and nothing really foss except the odbc driver managers. The best approach to doing this is to convert the access tables to use a sql server instead of the native mdb. This may or may not be practical/easy, but access can work over ODBC with the db on linux/postgresql (among others) where you would have a matching php client.Next best would be to write something to give web server access to the data you need on the windows box, and access it remote via http. -- Les Mikesell lesmikes...@gmail.com ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos === Attention: The information contained in this message and/or attachments from AgResearch Limited is intended only for the persons or entities to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipients is prohibited by AgResearch Limited. If you have received this message in error, please notify the sender immediately. === ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] iso size?
The whole gigabyte vs. gibibyte argument again! According to IEEE, NIST, and bunch of other organizations, a gigabyte is 1,000,000,000 bytes, and a gibibyte is 1,073,741,824 bytes. I can't wait until we start dealing with yobibytes!! --Russell -Original Message- From: centos-boun...@centos.org [mailto:centos-boun...@centos.org] On Behalf Of Yves Bellefeuille Sent: Tuesday, 22 November 2011 2:04 p.m. To: CentOS mailing list Subject: Re: [CentOS] iso size? On Monday 21 November 2011 14:13, Beartooth wrote: I've been being told, over and over, by K3B, Brasero, and Isomaster, on two machines, with three different downloads of 6.0, that the file is too large for the medium. Nautilus and the browser that die each download all say it's 4.4 GB; I've tried with two +R and an RW DVD, all of which are labelled 4.7 GB Two of the files are 32-bit, and one is 64 Nautilus and the browser think that 1 Gb is 1024 * 1024 * 1024 = 1,073,741,824 bytes, while the DVD manufacturer thinks that 1 Gb is 1,000,000,000 bytes. Therefore, what Nautilus and the browser call 4.4 Gb is what the DVD manufacturer calls 4.724 Gb, and that's why the image doesn't fit. Yves -- Yves Bellefeuille y...@storm.ca La Esperanta Civito ne rifuzas anticipe la kunlaboron de erarintoj, se ili konscias pri sia eraro. -- Heroldo Komunikas, n-ro 473. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos === Attention: The information contained in this message and/or attachments from AgResearch Limited is intended only for the persons or entities to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipients is prohibited by AgResearch Limited. If you have received this message in error, please notify the sender immediately. === ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] not using LVM for Linux VM guests?
Nope, doesn't work for me still. It's the root partition I'm trying to resize so if I delete then recreate to larger size, partprobe still fails then if I reboot it won't start as it can't find the root partition. As Barry suggested, I don't think you can reread the root partition. --Russell -Original Message- From: centos-boun...@centos.org [mailto:centos-boun...@centos.org] On Behalf Of James A. Peltier Sent: Friday, 18 November 2011 6:29 p.m. To: CentOS mailing list Subject: Re: [CentOS] not using LVM for Linux VM guests? - Original Message - | I've tried that, it returns a warning about kernel unable to reread | partition table and requiring a reboot to see any modifications. | Then the next call to pvcreate fails as it can't find the partition. | | --Russell | | -Original Message- | From: centos-boun...@centos.org [mailto:centos- boun...@centos.org] | On | Behalf Of Barry Brimer | Sent: Friday, 18 November 2011 11:13 a.m. | To: CentOS mailing list | Subject: Re: [CentOS] not using LVM for Linux VM guests? | | Quoting Smithies, Russell russell.smith...@agresearch.co.nz: | | Perhaps I'm doing it wrong then. | | 1). In Vmware, extend the existing disk by changing the | provisioned size in the vSphere client. | 2). In Centos, create an additional partition with fdisk, 3). | Somehow | reread the partition table without rebooting?? | 4). pvcreate | 5). vgextend | 6). lvextend | 7). resize2fs | | What I find is that without a reboot, the OS doesn't see the | partition so can't pvcreate etc. | | --Russell | | I don't believe partprobe works when you change the partitiontable of | the disk that the root filesystem is on. I could be remembering it | wrong. | | Barry It does but it (the new size) is not recognized until you delete the partition, recreate it with the new size, then run partprobe again, then resize the file system. It's worked for me in the past. -- James A. Peltier IT Services - Research Computing Group Simon Fraser University - Burnaby Campus Phone : 778-782-6573 Fax : 778-782-3045 E-Mail : jpelt...@sfu.ca Website : http://www.sfu.ca/itservices http://blogs.sfu.ca/people/jpeltier I will do the best I can with the talent I have ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos === Attention: The information contained in this message and/or attachments from AgResearch Limited is intended only for the persons or entities to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipients is prohibited by AgResearch Limited. If you have received this message in error, please notify the sender immediately. === ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] not using LVM for Linux VM guests?
-Original Message- From: centos-boun...@centos.org [mailto:centos-boun...@centos.org] On Behalf Of Jon Detert Sent: Friday, 18 November 2011 5:13 a.m. To: CentOS mailing list Subject: Re: [CentOS] not using LVM for Linux VM guests? Hello, - Original Message - From: Russell Smithies russell.smith...@agresearch.co.nz To: CentOS mailing list centos@centos.org Sent: Wednesday, November 16, 2011 2:37:54 PM Subject: [CentOS] not using LVM for Linux VM guests? I came across an old post comment yesterday (from http://echenh.blogspot.com/2010/04/how-to-extend-lvm-on-vmware- guest-o s.html ) discussing the hack of LVM on Linux VM guests and whether it's better not to use it to simplify disk management. I've re-posted the comment below, does it sound reasonable? Is it better to not use LVM on Linux VM guests? --Russell I've had the same question. I've decided to continue to use LVM, for these 2 reasons: 1) my hypervisor, good, bad or indifferent, is VMware ESX 4.x and ESXi 4.x. Those hypervisors can't create virtual disks greater than 256 GB. So, if I want a file-system larger than 256 GB, I have to have some other software - LVM, in this case. 2) I like being able to give disk devices descriptive names, like /dev/mapper/zimbra-data instead of simply '/dev/sdb' or similar. There are probably ways other than LVM to do that, but LVM does offer that flexibility. One thing I do avoid, however, is partitioning the virtual disks that might need to grow. This is because of the pain described in part below. The kernel often seems to have a hard time letting go of it's view of the partition table - either i have to umount the partition, or reboot. However, if i use the disk unpartitioned, the kernel has no prob, and I can *extend and/or resize*fs without umount or reboot. - Jon I have the same problem - I can never get the partition table reread without a reboot. It's a little annoying as I can resize the disk on a Win2k8 VM without a reboot but not Linux :-( --Russell === Attention: The information contained in this message and/or attachments from AgResearch Limited is intended only for the persons or entities to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipients is prohibited by AgResearch Limited. If you have received this message in error, please notify the sender immediately. === ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] not using LVM for Linux VM guests?
-Original Message- From: centos-boun...@centos.org [mailto:centos-boun...@centos.org] On Behalf Of Paul Griffith Sent: Friday, 18 November 2011 8:04 a.m. To: centos@centos.org Subject: Re: [CentOS] not using LVM for Linux VM guests? On 11/17/2011 11:13 AM, Jon Detert wrote: Hello, - Original Message - From: Russell Smithiesrussell.smith...@agresearch.co.nz To: CentOS mailing listcentos@centos.org Sent: Wednesday, November 16, 2011 2:37:54 PM Subject: [CentOS] not using LVM for Linux VM guests? I came across an old post comment yesterday (from http://echenh.blogspot.com/2010/04/how-to-extend-lvm-on-vmware- guest- os.html ) discussing the hack of LVM on Linux VM guests and whether it's better not to use it to simplify disk management. I've re-posted the comment below, does it sound reasonable? Is it better to not use LVM on Linux VM guests? --Russell I've had the same question. I've decided to continue to use LVM, for these 2 reasons: 1) my hypervisor, good, bad or indifferent, is VMware ESX 4.x and ESXi 4.x. Those hypervisors can't create virtual disks greater than 256 GB. So, if I want a file-system larger than 256 GB, I have to have some other software - LVM, in this case. Just to clarify one thing with large virtual disks. The size limitation is determined by the block size. To create a file bigger than 256GB, the VMFS filesystem needs to have a block size larger than 1MB. These are the maximums: VMFS-3 (ESX/ESXi 4.x) Block Size Maximum File Size 1 MB - 256 GB (default) 2 MB - 512 GB 4 MB - 1 TB 8 MB - 2 TB http://kb.vmware.com/kb/1003565 With VMFS-5 has a maximum virtual disk size of 2TB minus 512B, with a 1 MB block size. Cheers, Paul I just did the vSphere 5 What's New course and it looked they'd pumped all the maximums up to usable levels now. Be nice if they could decide on a licensing model that made more sense... --Russell === Attention: The information contained in this message and/or attachments from AgResearch Limited is intended only for the persons or entities to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipients is prohibited by AgResearch Limited. If you have received this message in error, please notify the sender immediately. === ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] not using LVM for Linux VM guests?
Tried that, as well as rescanning the scsi bus, Everything I've tried returns a warning about kernel unable to reread partition table and requiring a reboot to see any modifications. --Russell -Original Message- From: centos-boun...@centos.org [mailto:centos-boun...@centos.org] On Behalf Of Alexander Dalloz Sent: Friday, 18 November 2011 9:07 a.m. To: CentOS mailing list Subject: Re: [CentOS] not using LVM for Linux VM guests? Am 17.11.2011 20:25, schrieb Smithies, Russell: I have the same problem - I can never get the partition table reread without a reboot. It's a little annoying as I can resize the disk on a Win2k8 VM without a reboot but not Linux :-( Next time simply use the partprobe command. --Russell Alexander ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos === Attention: The information contained in this message and/or attachments from AgResearch Limited is intended only for the persons or entities to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipients is prohibited by AgResearch Limited. If you have received this message in error, please notify the sender immediately. === ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] not using LVM for Linux VM guests?
Perhaps I'm doing it wrong then. 1). In Vmware, extend the existing disk by changing the provisioned size in the vSphere client. 2). In Centos, create an additional partition with fdisk, 3). Somehow reread the partition table without rebooting?? 4). pvcreate 5). vgextend 6). lvextend 7). resize2fs What I find is that without a reboot, the OS doesn't see the partition so can't pvcreate etc. --Russell -Original Message- From: centos-boun...@centos.org [mailto:centos-boun...@centos.org] On Behalf Of Reindl Harald Sent: Friday, 18 November 2011 10:48 a.m. To: centos@centos.org Subject: Re: [CentOS] not using LVM for Linux VM guests? Am 17.11.2011 22:36, schrieb Smithies, Russell: Tried that, as well as rescanning the scsi bus, Everything I've tried returns a warning about kernel unable to reread partition table and requiring a reboot to see any modifications. gparted does tell you this since years after modify but i have never in my life rebooted a linux system because partition changes === Attention: The information contained in this message and/or attachments from AgResearch Limited is intended only for the persons or entities to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipients is prohibited by AgResearch Limited. If you have received this message in error, please notify the sender immediately. === ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] not using LVM for Linux VM guests?
I've tried that, it returns a warning about kernel unable to reread partition table and requiring a reboot to see any modifications. Then the next call to pvcreate fails as it can't find the partition. --Russell -Original Message- From: centos-boun...@centos.org [mailto:centos-boun...@centos.org] On Behalf Of Barry Brimer Sent: Friday, 18 November 2011 11:13 a.m. To: CentOS mailing list Subject: Re: [CentOS] not using LVM for Linux VM guests? Quoting Smithies, Russell russell.smith...@agresearch.co.nz: Perhaps I'm doing it wrong then. 1). In Vmware, extend the existing disk by changing the provisioned size in the vSphere client. 2). In Centos, create an additional partition with fdisk, 3). Somehow reread the partition table without rebooting?? 4). pvcreate 5). vgextend 6). lvextend 7). resize2fs What I find is that without a reboot, the OS doesn't see the partition so can't pvcreate etc. --Russell -Original Message- From: centos-boun...@centos.org [mailto:centos-boun...@centos.org] On Behalf Of Reindl Harald Sent: Friday, 18 November 2011 10:48 a.m. To: centos@centos.org Subject: Re: [CentOS] not using LVM for Linux VM guests? Am 17.11.2011 22:36, schrieb Smithies, Russell: Tried that, as well as rescanning the scsi bus, Everything I've tried returns a warning about kernel unable to reread partition table and requiring a reboot to see any modifications. gparted does tell you this since years after modify but i have never in my life rebooted a linux system because partition changes Step 3 .. run partprobe. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos === Attention: The information contained in this message and/or attachments from AgResearch Limited is intended only for the persons or entities to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipients is prohibited by AgResearch Limited. If you have received this message in error, please notify the sender immediately. === ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS] not using LVM for Linux VM guests?
I came across an old post comment yesterday (from http://echenh.blogspot.com/2010/04/how-to-extend-lvm-on-vmware-guest-os.html ) discussing the hack of LVM on Linux VM guests and whether it's better not to use it to simplify disk management. I've re-posted the comment below, does it sound reasonable? Is it better to not use LVM on Linux VM guests? --Russell --- At my job, after doing the same kind of procedure graph, we began to ask ourselves, why are using a LVM on a Linux VM guests? Since we're no longer living in the physical OS world, we didn't need to use the OS hacks(LVM) to overcome physical disk limitations anymore. We decided to Just let the hypervisor and virtual storage do that work for us. For example, in our production setup (3 tier commerce with VMs for database , webserver, and appserver), we're see a great improvement in managability and performance (10%) by just dropping LVM, and most partitions. In your example, the resize process is 7 functional steps: 1. Increase size of VMDK 2. In VM OS, Create Partition (??) 3. REBOOT (!!) 4. PVCreate 5. VGExtend 6. LVExtend 7. Resize2fs Going to a LVM/partition-less setup reduces expansion to 3 steps and we don't need to take the VM OS offline! 1. Increase size of VMDK 2- Inside the VM, OS, rescan the scsi drive with:'echo 1 /sys/class/scsi_device//rescan; dmesg' (dmesg will check that you drive isize has grown) 3- Resize2fs. Our current disk arrangement has 3 VM HD devices 0 - small device (100M) with a single BOOT partition 1 - entire device is / 2 - entire device is SWAP Doing this has simplified resizing so much, I now let the junior admins and my manager expand drive space as needed. It's also let's us really be spartan on space since expansion is so quick. Instead of increasing systems in 30-50GB chunks, we can do 10-15GB and let our rmonitoring system warn us when space gets tight. - === Attention: The information contained in this message and/or attachments from AgResearch Limited is intended only for the persons or entities to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipients is prohibited by AgResearch Limited. If you have received this message in error, please notify the sender immediately. === ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS] reading vdump files?
I have a lot of data in some vdump files backed up from a Tru64 system that I now need to recover to a Centos server. We no longer have any servers running Tru64, is there any way to extract/convert them on a standard linux system? Ideally converting in bulk to a tar would do. Any ideas? Russell Smithies === Attention: The information contained in this message and/or attachments from AgResearch Limited is intended only for the persons or entities to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipients is prohibited by AgResearch Limited. If you have received this message in error, please notify the sender immediately. === ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Recommended mailing list manager for CentOS 5.6
I'll put in a plug for HP Cluster Management Utility http://h20311.www2.hp.com/HPC/cache/412128-0-0-0-121.html?jumpid=reg_R1002_USEN We also use C3 - an oldy but a goody :-) http://www.csm.ornl.gov/torc/C3/index.html --Russell -Original Message- From: centos-boun...@centos.org [mailto:centos-boun...@centos.org] On Behalf Of Patrick Lists Sent: Wednesday, 20 July 2011 12:27 p.m. To: CentOS mailing list Subject: Re: [CentOS] Recommended mailing list manager for CentOS 5.6 On 07/20/2011 02:17 AM, Dave Stevens wrote: On Tuesday, July 19, 2011 05:07:16 PM John J. Boyer wrote: Does CentOS 5.6 have a mailing list manager like ecartis or majordomo? I want to set up mailing lists for my server in the cloud for three domains that I own. What mailing list managers do yourecommend, and where can they be found? I don't ming compiling source code. Thanks, mailman has always worked well for me, easy to use, reasonable defaults, mail archived by default. In addition to Dave's fine suggestion, there is also Sympa: http://www.sympa.org/ Regards, Patrick ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos === Attention: The information contained in this message and/or attachments from AgResearch Limited is intended only for the persons or entities to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipients is prohibited by AgResearch Limited. If you have received this message in error, please notify the sender immediately. === ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS] preventing symlinks?
This may be more of a general linux question but is there a simple way of preventing users from creating symlinks to or from certain directories? I have a /scratch dir that's a single 27TB volume and I don't want users linking their home dirs as there's a chance it will screw up our external backups. Is this a job for SELinux? Any ideas? Thanx, Russell === Attention: The information contained in this message and/or attachments from AgResearch Limited is intended only for the persons or entities to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipients is prohibited by AgResearch Limited. If you have received this message in error, please notify the sender immediately. === ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] ext4 in CentOS 5.6?
We have a single 27TB partition (35 x 1TB drives as RAID5+0 in an HP MDS600), just formatted it xfs and had no problems with it so far. It's used as scratch space so not too concerned about performance. --Russell -Original Message- From: centos-boun...@centos.org [mailto:centos-boun...@centos.org] On Behalf Of Marian Marinov Sent: Friday, 24 June 2011 7:48 a.m. To: CentOS mailing list Subject: Re: [CentOS] ext4 in CentOS 5.6? On Thursday 23 June 2011 22:31:28 PJ wrote: On Thu, Jun 23, 2011 at 1:07 PM, Marian Marinov m...@yuhu.biz wrote: On Thursday 23 June 2011 19:16:37 PJ wrote: I'm sure many are running ext4 FS's in production, but just want to be re-assured that there are not currently any major issues before starting a new project that looks like it will be using ext4. I've previously been using xfs but the software for this project requires ext3/ext4. I'm always very cautious before jumping onto a new FS, (new in the sense it is officially supported now) Thanks in advance! I'm running some 50 servers with ext4 each server has 2x15TB ext4 partitions. I haven't had an issue with that setup. The first server was setup 3 years ago. It is quite faster then XFS in terms of write performance and thus far reliable without any major problem. Keep in mind that user land tools are limited and the biggest partition you can create with them at the moment is 16TB. You can recompile the tools and remove this limitation if that is a problem for you. Regards, Marian Marinov Thanks for all the great replies everyone. I've got an 18TB partition - the limit is 16TB even in x86_64? Yes. At least it was so, last year. I haven't checked recently. And I don't have a spare machine to repartition for the test. We have a 30TB RAID6 array and I was really annoyed that I had to make two partitions to utilze the whole space. The wiki pages are still not updated: http://en.wikipedia.org/wiki/Comparison_of_file_systems https://ext4.wiki.kernel.org/index.php/Ext4_Howto NOTE: Although very large fileystems are on ext4's feature list, current e2fsprogs currently still limits the filesystem size to 2^32 blocks (16TiB for a 4KiB block filesystem). Allowing filesystems larger than 16T is one of the very next high-priority features to complete for ext4. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos -- Best regards, Marian Marinov === Attention: The information contained in this message and/or attachments from AgResearch Limited is intended only for the persons or entities to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipients is prohibited by AgResearch Limited. If you have received this message in error, please notify the sender immediately. === ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] OT: high static in server room
Are you using anti-static flooring? I know in our new server room extension there was some very expensive lino that went down. This sort of stuff: http://www.afloor.co.uk/vinyl-flooring-lino/anti-static-flooring.html --Russell -Original Message- From: centos-boun...@centos.org [mailto:centos-boun...@centos.org] On Behalf Of Rob Kampen Sent: Thursday, 16 June 2011 2:24 p.m. To: CentOS mailing list Subject: Re: [CentOS] OT: high static in server room Fajar Priyanto wrote: On Thu, Jun 16, 2011 at 2:19 AM, Dan Carl d...@bluestarshows.com wrote: If you spend a lot of time in your server room, you might also consider a fish tank. It will add moisture to your room and give you something to look at other than flashing leds:-) Is this a joke or a real thing? I'm really considering the fish tank. Btw, I've checked. My room humidity is 23%. That should be ok, shouldn't it? But still I saw the spark. Very low - adding some water somewhere would likely help. Carpet? Nylon products against natural ones like cotton or wool?? Btw again, I was in the middle of major work on a blade chassis, and I left some of the slots open for several days. Could that be the reason of the high static too? ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos === Attention: The information contained in this message and/or attachments from AgResearch Limited is intended only for the persons or entities to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipients is prohibited by AgResearch Limited. If you have received this message in error, please notify the sender immediately. === ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS] changing column widths in top?
Not specifically a Centos question but does anyone know how to change the column widths in top? I'm in the unique position where I need to be able to see more than .0% CPU :-) Thanx, Russell === Attention: The information contained in this message and/or attachments from AgResearch Limited is intended only for the persons or entities to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipients is prohibited by AgResearch Limited. If you have received this message in error, please notify the sender immediately. === ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] changing column widths in top?
Thought as much :-( Atop seems to display much better, currently running at 12728% CPU :-) --Russell -Original Message- From: centos-boun...@centos.org [mailto:centos-boun...@centos.org] On Behalf Of John R Pierce Sent: Wednesday, 13 April 2011 9:27 a.m. To: centos@centos.org Subject: Re: [CentOS] changing column widths in top? On 04/12/11 2:10 PM, Smithies, Russell wrote: Not specifically a Centos question but does anyone know how to change the column widths in top? I'm in the unique position where I need to be able to see more than .0% CPU :-) probably have to hack the source :-/ ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos === Attention: The information contained in this message and/or attachments from AgResearch Limited is intended only for the persons or entities to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipients is prohibited by AgResearch Limited. If you have received this message in error, please notify the sender immediately. === ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] changing column widths in top?
Htop looks interesting and I might try it on one of our other servers but on this one I only see the first 60 CPUs. --Russell -Original Message- From: centos-boun...@centos.org [mailto:centos-boun...@centos.org] On Behalf Of Lucian Sent: Wednesday, 13 April 2011 9:41 a.m. To: CentOS mailing list Subject: Re: [CentOS] changing column widths in top? On Tue, Apr 12, 2011 at 10:35 PM, Smithies, Russell russell.smith...@agresearch.co.nz wrote: Thought as much :-( Atop seems to display much better, currently running at 12728% CPU :- ) Give htop a try as well; it's in EPEL AFAIK. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos === Attention: The information contained in this message and/or attachments from AgResearch Limited is intended only for the persons or entities to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipients is prohibited by AgResearch Limited. If you have received this message in error, please notify the sender immediately. === ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] NIC bonding - missing eth0?
Yep, that's the problem - it keeps coming up with 3 ports instead of 4 and eth0 is always has a different Aggregator ID. No idea why it does that - the other server is setup the same and it's bonding works perfectly. The only thing I can think of is some of the Xen virtual interfaces and bridges as disrupting it. --Russell From: centos-boun...@centos.org [mailto:centos-boun...@centos.org] On Behalf Of Cameron Kerr Sent: Thursday, 17 February 2011 6:18 a.m. To: CentOS mailing list Subject: Re: [CentOS] NIC bonding - missing eth0? On 16/02/2011, at 3:12 PM, Smithies, Russell wrote: 802.3ad info LACP rate: slow Active Aggregator Info: Aggregator ID: 19 Number of ports: 3 Actor Key: 17 Partner Key: 5 Partner Mac Address: 00:1b:90:3d:90:c0 Slave Interface: eth0 MII Status: up Link Failure Count: 0 Permanent HW addr: 1c:c1:de:74:97:5c Aggregator ID: 18 This is different. Slave Interface: eth1 MII Status: up Link Failure Count: 0 Permanent HW addr: 1c:c1:de:74:97:5d Aggregator ID: 19 Slave Interface: eth2 MII Status: up Link Failure Count: 0 Permanent HW addr: 1c:c1:de:74:97:5e Aggregator ID: 19 Slave Interface: eth3 MII Status: up Link Failure Count: 0 Permanent HW addr: 1c:c1:de:74:97:5f Aggregator ID: 19 === Attention: The information contained in this message and/or attachments from AgResearch Limited is intended only for the persons or entities to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipients is prohibited by AgResearch Limited. If you have received this message in error, please notify the sender immediately. === ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS] NIC bonding - missing eth0?
I have nic bonding (mode=802.3ad) setup on 2 servers, both running Centos 5.5 In the Active Aggregator Info, on one reports 4 ports - which is correct - but the other only reports 3 ports. It's always eth0 that shows a different aggregator ID. Changing the cables around so it hits a different port on the switch makes no difference. The switch is correctly configured for the port channel. The only difference between the 2 servers is one is running Xen (kernel-xen-2.6.18-194.32.1.el5.centos.plus) so I have a few virtual interfaces and bridges. Any ideas what might be happening? Thanx, Russell Smithies [root@invmhp01 ~]# cat /proc/net/bonding/bond0 Ethernet Channel Bonding Driver: v3.4.0 (October 7, 2008) Bonding Mode: IEEE 802.3ad Dynamic link aggregation Transmit Hash Policy: layer2 (0) MII Status: up MII Polling Interval (ms): 100 Up Delay (ms): 0 Down Delay (ms): 0 802.3ad info LACP rate: slow Active Aggregator Info: Aggregator ID: 19 Number of ports: 3 Actor Key: 17 Partner Key: 5 Partner Mac Address: 00:1b:90:3d:90:c0 Slave Interface: eth0 MII Status: up Link Failure Count: 0 Permanent HW addr: 1c:c1:de:74:97:5c Aggregator ID: 18 Slave Interface: eth1 MII Status: up Link Failure Count: 0 Permanent HW addr: 1c:c1:de:74:97:5d Aggregator ID: 19 Slave Interface: eth2 MII Status: up Link Failure Count: 0 Permanent HW addr: 1c:c1:de:74:97:5e Aggregator ID: 19 Slave Interface: eth3 MII Status: up Link Failure Count: 0 Permanent HW addr: 1c:c1:de:74:97:5f Aggregator ID: 19 [root@invmhp01 ~]# ifconfig bond0 Link encap:Ethernet HWaddr 1C:C1:DE:74:97:5C inet addr:147.158.130.183 Bcast:147.158.131.255 Mask:255.255.252.0 inet6 addr: fe80::1ec1:deff:fe74:975c/64 Scope:Link UP BROADCAST RUNNING MASTER MULTICAST MTU:1500 Metric:1 RX packets:64087 errors:0 dropped:0 overruns:0 frame:0 TX packets:18179 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:8293500 (7.9 MiB) TX bytes:31362799 (29.9 MiB) eth0 Link encap:Ethernet HWaddr 1C:C1:DE:74:97:5C UP BROADCAST RUNNING SLAVE MULTICAST MTU:1500 Metric:1 RX packets:5770 errors:0 dropped:0 overruns:0 frame:0 TX packets:21 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:410102 (400.4 KiB) TX bytes:2524 (2.4 KiB) eth1 Link encap:Ethernet HWaddr 1C:C1:DE:74:97:5C UP BROADCAST RUNNING SLAVE MULTICAST MTU:1500 Metric:1 RX packets:22247 errors:0 dropped:0 overruns:0 frame:0 TX packets:17436 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:1424685 (1.3 MiB) TX bytes:31161969 (29.7 MiB) Interrupt:239 eth2 Link encap:Ethernet HWaddr 1C:C1:DE:74:97:5C UP BROADCAST RUNNING SLAVE MULTICAST MTU:1500 Metric:1 RX packets:6223 errors:0 dropped:0 overruns:0 frame:0 TX packets:189 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:442326 (431.9 KiB) TX bytes:19993 (19.5 KiB) Interrupt:235 eth3 Link encap:Ethernet HWaddr 1C:C1:DE:74:97:5C UP BROADCAST RUNNING SLAVE MULTICAST MTU:1500 Metric:1 RX packets:29852 errors:0 dropped:0 overruns:0 frame:0 TX packets:537 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:6016657 (5.7 MiB) TX bytes:179281 (175.0 KiB) Interrupt:231 loLink encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:26818 errors:0 dropped:0 overruns:0 frame:0 TX packets:26818 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:38558929 (36.7 MiB) TX bytes:38558929 (36.7 MiB) peth0 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF inet6 addr: fe80::fcff::feff:/64 Scope:Link UP BROADCAST RUNNING NOARP MTU:1500 Metric:1 RX packets:41498 errors:0 dropped:0 overruns:0 frame:0 TX packets:251 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:312 (2.8 MiB) TX bytes:59877 (58.4 KiB) Interrupt:243 vif0.0Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF inet6 addr: fe80::fcff::feff:/64 Scope:Link UP BROADCAST RUNNING NOARP MTU:1500 Metric:1 RX packets:127 errors:0 dropped:0 overruns:0 frame:0 TX packets:39354 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:15520 (15.1 KiB) TX bytes:2817598 (2.6 MiB) virbr0Link encap:Ethernet HWaddr 00:00:00:00:00:00 inet addr:192.168.122.1 Bcast:192.168.122.255 Mask:255.255.255.0 inet6 addr:
Re: [CentOS] Virtualization supporting 1000Mbps nics?
I'm using the gplpv passthru driver now so it's using my nic directly rather than a virtual Realtek 100Mbps one and I'm getting much better transfer speeds - a recommendation from the Xen mailing list. Regularly getting 120Mbps drag and drop to a file share on a 2k8R2 server a thousand miles away. Was getting 25Mbps with the virtual Realtek. --Russell -Original Message- From: centos-boun...@centos.org [mailto:centos-boun...@centos.org] On Behalf Of Nico Kadel-Garcia Sent: Wednesday, 16 February 2011 3:42 p.m. To: CentOS mailing list Subject: Re: [CentOS] Virtualization supporting 1000Mbps nics? On Mon, Feb 14, 2011 at 2:34 PM, Smithies, Russell russell.smith...@agresearch.co.nz wrote: I've got xen-3.0.3-105.el5_5.5 running on Centos 5.5 and all is running smooth but I notice that any VMs running under it only have access to Realtek RTL8139C at 100 Mbps nics. In general, don't bother. Let the virtualization server handle all the cute features of the network interfaces, because it's going to *anyway* as part of its role translating the kernel operations of the virtualized driver into real hardware interactions with the NIC you actually use. We have 4 x 1G nics configured in a port channel so I'd really like to be able to give my VMs 1000Mbps nics. Actually test the performance, and if possible, use a para-virtualized kernel. You should see surprisingly good performance. Does anyone know if this is possible and how to do it? If not, does KVM support faster nics because at this point it would be fairly simple to change. See above. In reality, I'll be surprised if you don't easily outperform a physical RealTek device. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos === Attention: The information contained in this message and/or attachments from AgResearch Limited is intended only for the persons or entities to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipients is prohibited by AgResearch Limited. If you have received this message in error, please notify the sender immediately. === ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS] Virtualization supporting 1000Mbps nics?
I've got xen-3.0.3-105.el5_5.5 running on Centos 5.5 and all is running smooth but I notice that any VMs running under it only have access to Realtek RTL8139C at 100 Mbps nics. We have 4 x 1G nics configured in a port channel so I'd really like to be able to give my VMs 1000Mbps nics. Does anyone know if this is possible and how to do it? If not, does KVM support faster nics because at this point it would be fairly simple to change. Thanx, Russell Smithies === Attention: The information contained in this message and/or attachments from AgResearch Limited is intended only for the persons or entities to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipients is prohibited by AgResearch Limited. If you have received this message in error, please notify the sender immediately. === ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS] ~/.forward file?
Hi all, I'm just poking thru our previous sysadmin's user adding script and saw reference to a ~/.forward file containing the users email address. Any idea what it might be for? It's a tricky one to Google ;-) Thanx, Russell Smithies === Attention: The information contained in this message and/or attachments from AgResearch Limited is intended only for the persons or entities to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipients is prohibited by AgResearch Limited. If you have received this message in error, please notify the sender immediately. === ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS] nic bonding
I've just setup nic bonding on our server (DL585-G7 running Centos 5.5 x86_64) as detailed on the wiki: http://wiki.centos.org/TipsAndTricks/BondingInterfaces and all seems fine but from other howto's I've seen on the web, they're should be a /proc/net/bond0/info As far as I can see, I don't have one and I'm not sure if it should be there or its absence is a sign I've done something wrong. I found /proc/net/dev_snmp6/bond0 but is the same? Any ideas? Thanx, Russell Smithies === Attention: The information contained in this message and/or attachments from AgResearch Limited is intended only for the persons or entities to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipients is prohibited by AgResearch Limited. If you have received this message in error, please notify the sender immediately. === ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] nic bonding
Afraid not, no /proc/net/bonding either. This is all I can see: [root@inbfop03 ~]# find / -name bonding 2/dev/null /lib/modules/2.6.18-194.32.1.el5/kernel/drivers/net/bonding /lib/modules/2.6.18-194.el5/kernel/drivers/net/bonding /usr/src/kernels/2.6.18-194.el5-x86_64/drivers/net/bonding /usr/src/kernels/2.6.18-194.32.1.el5-x86_64/drivers/net/bonding [root@inbfop03 ~]# find / -name bond0 2/dev/null /sys/class/net/bond0 /proc/sys/net/ipv6/conf/bond0 /proc/sys/net/ipv6/neigh/bond0 /proc/sys/net/ipv4/conf/bond0 /proc/sys/net/ipv4/neigh/bond0 /proc/net/dev_snmp6/bond0 It's not really a problem as it's working OK, just odd it's not there. --Russell -Original Message- From: Steve Thompson [mailto:s...@vgersoft.com] Sent: Monday, 17 January 2011 2:13 p.m. To: Smithies, Russell Subject: Re: [CentOS] nic bonding On Mon, 17 Jan 2011, Smithies, Russell wrote: I've just setup nic bonding on our server (DL585-G7 running Centos 5.5 x86_64) as detailed on the wiki: http://wiki.centos.org/TipsAndTricks/BondingInterfaces and all seems fine but from other howto's I've seen on the web, they're should be a /proc/net/bond0/info That would be /proc/net/bonding/bond0 -steve === Attention: The information contained in this message and/or attachments from AgResearch Limited is intended only for the persons or entities to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipients is prohibited by AgResearch Limited. If you have received this message in error, please notify the sender immediately. === ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] nic bonding
Sorry, I'm not sure I understand your comments. I understand what bonding is and how it works and ours is working fine. Just not sure why I don't have any /proc/net/bond* files --Russell -Original Message- From: centos-boun...@centos.org [mailto:centos-boun...@centos.org] On Behalf Of Rajagopal Swaminathan Sent: Monday, 17 January 2011 4:31 p.m. To: CentOS mailing list Subject: Re: [CentOS] nic bonding Greetings, do updatedb Please locate the somethingbonding.txt in the installation go through the procedure You need to modprobe bonding (with mii settings) you need to manually create the bond0 files you need to edit ethx interfaces to enslave them to the bonding master you need to configure the ports in a managed switch to accomodate bonded interface ports. Don't expect n x speed (where n is the number of NICs bonded). HTH Regards, Rjagopal On 1/17/11, Smithies, Russell russell.smith...@agresearch.co.nz wrote: Afraid not, no /proc/net/bonding either. This is all I can see: [root@inbfop03 ~]# find / -name bonding 2/dev/null /lib/modules/2.6.18-194.32.1.el5/kernel/drivers/net/bonding /lib/modules/2.6.18-194.el5/kernel/drivers/net/bonding /usr/src/kernels/2.6.18-194.el5-x86_64/drivers/net/bonding /usr/src/kernels/2.6.18-194.32.1.el5-x86_64/drivers/net/bonding [root@inbfop03 ~]# find / -name bond0 2/dev/null /sys/class/net/bond0 /proc/sys/net/ipv6/conf/bond0 /proc/sys/net/ipv6/neigh/bond0 /proc/sys/net/ipv4/conf/bond0 /proc/sys/net/ipv4/neigh/bond0 /proc/net/dev_snmp6/bond0 It's not really a problem as it's working OK, just odd it's not there. --Russell -Original Message- From: Steve Thompson [mailto:s...@vgersoft.com] Sent: Monday, 17 January 2011 2:13 p.m. To: Smithies, Russell Subject: Re: [CentOS] nic bonding On Mon, 17 Jan 2011, Smithies, Russell wrote: I've just setup nic bonding on our server (DL585-G7 running Centos 5.5 x86_64) as detailed on the wiki: http://wiki.centos.org/TipsAndTricks/BondingInterfaces and all seems fine but from other howto's I've seen on the web, they're should be a /proc/net/bond0/info That would be /proc/net/bonding/bond0 -steve === Attention: The information contained in this message and/or attachments from AgResearch Limited is intended only for the persons or entities to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipients is prohibited by AgResearch Limited. If you have received this message in error, please notify the sender immediately. === ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
