Re: [CentOS] 32-bit kernel+XFS+16.xTB filesystem = potential disaster
On 6.4.2011 17:27, Warren Young wrote: On 4/5/2011 11:24 AM, Brandon Ooi wrote: Afaik 32-bit binaries do run on the 64-bit build and compat libraries exist for most everything. You should evaluate if you really *really* need 32-bit. Yes, thanks for assuming I don't know what I was talking about when I wrote that we had a hard requirement for 32-bit in this application. Since you seem to care, we're stuck with 32-bit for this particular server because it needs to use an uncommon PCI card that does have Linux drivers but they only work with 32-bit kernels. The driver will rebuild against a 64-bit kernel, but it oopses it when you try to use it. The card is a legacy design, so no one has bothered to do debug this, and likely no one ever will. And before you ask, no, there is no direct replacement for this PCI card that does support 64-bit kernels. The path forward is to use an entirely different technology, which is great, but using it requires changing physical infrastructure ($$$) that the server plugs into. Legacy is hard. Next time someone tells you they can't use the latest and greatest for some reason, you might take them at their word. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos Hi, Just a shot in the darkbut can't you have a x86_64 NFS server export a fs larger then 16TB and mount that on your x86 machine for use with your application? Bgrds, FOG ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] upgrading storage on hardware RAID 10 possible?
On 13.8.2010 09:45, John Doe wrote: From: Rudi Ahlersr...@softdux.com Can anyone please tell me, from experience, if it's possible to upgrade the hard drives in a RAID 10 system from 250GB HDD's to 500GB / 750GB HDD's, while the server is running? The server runs CentOS 5.5 x64. Our hardware vendors simply always say no, so we never actually tried doing this. So, I'm wondering, is it possible (and safe) to upgrade the existing drives to larger drives in a running server? When you said we never actually tried... tried what exactly? It depends... on your RAID ctrl of course... By example, with HP SmartArrays, you should be able to unplug a disk, plug a bigger one and let it rebuild. Rinse and repeat for all the disks. Then, you can expand the array... Although I did not try it so far. JD ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos I've done this multiple times on IBM ServeRaid controllers as well as HP SmartArray controllers. First, make sure your firmware is up-to-date (just to be on the safe side:). Unplug the first disk, replace it with whatever disk you want to add instead. Let the raid controller finish rebuilding the array and repeat the process. After you have finished replacing all of the disks you can run the Raid Manager and resize the array. But beware, some low end controllers do not support resizing of the raid array so make sure you check your vendors documentation :). Bgrds, Finnur ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Kickstart from tagged VLAN?
On 2.7.2010 04:46, Scott Beardsley wrote: From start to finish anaconda needs to pick up a dynamic address from vlan 100. After that the kickstart file specifies the static adress from vlan100 and it's address from the backup subnet. Anyone know if this is currently possible? If so any nod in the right direction would be appreciated I dunno how you'd get the BIOS to do a PXE boot off a vlan. I remember running into this a while ago. I think most multi-layer switches can have a default VLAN that untagged packets will go to. Check the docs for your switch. Scott ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos On Cisco switches it would be called native vlan if i remember correctly: One way of doing it (if using Cisco :): interface GigabitEthernet0/1 description nodeX switchport trunk native vlan 100 switchport trunk allowed vlan 100,101 switchport mode trunk spanning-tree portfast trunk spanning-tree bpdufilter enable end Bgrds, Finnur ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] IO statistic Centos 5.4
On 23.10.2009 12:35, Sergio Belkin wrote: Hi, Has kernel-2.6.18-128.1.1 support for IO statistic for example when using pidstat -d? Thanks in advance! Hi, You need a kernel from CentOS 5.4 (2.6.18-164.el5 or newer) to get the fancy new iostats ;) Bgrds, Finnzi ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Calling all Hackers from Big stan
On 19.10.2009 6:26, Ross Walker wrote: On Mon, Oct 19, 2009 at 2:19 PM, MLmailingli...@mailnewsrss.com wrote: I want to learn to hack what do I need to do in order to start. Umm, watch: Hackers: http://www.imdb.com/title/tt0113243/ Takedown: http://www.imdb.com/title/tt0159784/ Isn't that how we all learned? You're forgetting: Sneakers: http://www.imdb.com/title/tt0105435/ One of my favorites. -Ross ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos And one more, Wargames: http://www.imdb.com/title/tt0086567/ Bgrds, Finnzi ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] SELinux messages after compiling new kernel
On 27.8.2009 17:15, Sergio Belkin wrote: 2009/8/27 Filipe Brandenburgerfilbran...@gmail.com: Hi, On Thu, Aug 27, 2009 at 12:46, Sergio Belkinseb...@gmail.com wrote: Jim, thanks for the suggestion, but Firstly: I need a newer kernel in order to get IO statistics from tools like atop, pidstat, etc. And secondly and most important: my boss wants that :) Then CentOS is not what you want. There is a reason why RHEL/CentOS does not ship with the latest kernel (and other components) and backports fixes instead. It's not trivial to make different versions of these components work together. If you try to replace the kernel (or other core components) you will see how painful it is. In fact, you started to see it already. You may try to continue to go that way, but I doubt anyone in this list will be able to help you there... you're pretty much on your own. So I'd be glad to hear other kind of solution :) Look at the latest Fedora or Ubuntu or another one of the cutting edge distributions that ship with more recent versions of components. Or ask yourself (or your boss) *WHY* you think you really need a later version of a certain component. What is your real problem? Is it support to a certain hardware? Is it network related? Is it (unfounded) fear that the kernel in CentOS might be vulnerable? It might be possible to solve your problem using CentOS in another way, if you come back to the list with the real problem we might be able to help you better. HTH, Felipe I've just explained the reason why I've compiled. IO statistics by process will be included in 5.4You could try to use the RHEL 5.4 beta kernels (Just remember, those are beta). Bgrds, Finnzi ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] BiND Failover
Per Qvindesland wrote: Hi list, I've two servers running the same ldap service. A is primary server and B is simply a mirror, and accounts from server A are constantly synchronized with B. Now I don't have a automatic failover solution, whenever server A goes down, I have to point the domain's A record to server B and wait for the DNS to get updated. Takes quite a lot of time but the ldap service is crucial to the system and shouldn't be down for longer than a few minutes. I've heard about Dyndns? They provide automatic failover if one server does down, what I want to know is if I can do the same using Bind? And if it's possible to do it automatically? Without human intervention. I don't want a round-robin solution, I want a automatic switchover if primary box goes down. Regards Per Qvindesland ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos You could try something like this: http://dag.wieers.com/howto/bits/bind-ddns.php Bgrds, Finnur ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] saslauthd crashes
Bazooka Joe wrote: I just took my first cent server into production and now saslauthd keep crashing after brute force attack. I found a bug report so this has already been reported but not fixed. http://bugs.centos.org/print_bug_page.php?bug_id=2860 I assume this has to be a large problem for many people and am surprised it hasn't been fixed yet. Has anyone found a work around for this bug? Is there a better rpm repo for a saslauthd that won't crash? -bazooka ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos Hi, See upstream bug here: https://bugzilla.redhat.com/show_bug.cgi?id=433583 Bgrds, Finnur ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] OT - Monitoring tool
Robert Spangler wrote: Hello everyone, While I know this isn't Centos related, you guys seems to be on top of your game around here. Sorry for the off-topic. I'm looking for a tool to monitor my servers and send either an email or page or both when something breaks. I would like it to monitor all sorts of services on the servers with one small detail, I'd like it to be able to confiugre so if the DBA need something monitor that is hosted on a shared system that they can only change what they are responsible for and not something else that is being monitored on that system. Is there such a program out there? Hi I have been using Nagios for monitoring the network and a few servers. It works fine. It's not the easiest thing to get it working properly. Regards M. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos Hi, +1 for Nagios. I am using it in a enviroment of 500+ servers without a hitch. Bgrds, Finnur ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] dm-multipath use
Are folks in the Centos community succesfully using device-mapper-multipath? I am looking to deploy it for error handling on our iSCSI setup but there seems to be little traffic about this package on the Centos forums, as far as I can tell, and there seems to be a number of small issues based on my reading the dm-multipath developer lists and related resources. -geoff Geoff Galitz Blankenheim NRW, Deutschland http://www.galitz.org ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos Hi, I'm running ~45 machines that boot from SAN/or are connected to our SAN fabrics on CentOS 4.x/5.x (And about 20 more running RHEL5) without problems at all. The storage is IBM SVC (2145). Just make sure multipathd is running on your system, otherwise it will not recover paths correctly. Thanks, Finnur ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] How is this possible?
MHR wrote: As an experiment, I am attempting to build a more recent version of GNOME than 2.16.0 on CentOS 5.1. I've tried both garnome and jhbuild, and neither one works quite right. Jhbuild blows out looking for a dbus-glib-1 revision = 0/74 (the release rev is 0.70), so I downloaded that and tried to build it. This results in the following error: gcc -g -O2 -Wall -Wchar-subscripts -Wmissing-declarations -Wmissing-prototypes -Wnested-externs -Wpointer-arith -Wcast-align -Wfloat-equal -Wsign-compare -o .libs/dbus-binding-tool dbus-binding-tool-glib.o dbus-glib-tool.o ./.libs/libdbus-gtool.a -L/lib64 ./.libs/libdbus-glib-1.so -ldbus-1 -lgobject-2.0 -lglib-2.0 /usr/lib/libexpat.so -lnsl /usr/lib/libexpat.so: could not read symbols: File in wrong format collect2: ld returned 1 exit status make[4]: *** [dbus-binding-tool] Error 1 make[4]: Leaving directory `/home/mhr/Download/dbus-glib-0.74/dbus' make[3]: *** [all-recursive] Error 1 make[3]: Leaving directory `/home/mhr/Download/dbus-glib-0.74/dbus' make[2]: *** [all] Error 2 make[2]: Leaving directory `/home/mhr/Download/dbus-glib-0.74/dbus' make[1]: *** [all-recursive] Error 1 make[1]: Leaving directory `/home/mhr/Download/dbus-glib-0.74' make: *** [all] Error 2 When I try to use garnome, it eventually runs into exactly the same error. I've checked /usr/lib/libexpat.so, and this is what I get: $ ls -l /usr/lib/libexpat.so lrwxrwxrwx 1 root root 27 Jan 8 13:11 /usr/lib/libexpat.so - ../../lib/libexpat.so.0.5.0 $ ls -l /lib/libexpat.so.0.5.0 -rwxr-xr-x 1 root root 133056 Jan 6 2007 /lib/libexpat.so.0.5.0 $ file /lib/libexpat.so.0.5.0 /lib/libexpat.so.0.5.0: ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), stripped When I look at this library with nm, lld and objdump, they all seem to be able to read it just fine. There is also the 64 bit version that lives in /ib64 and has a .ink from /usr/lib64, and that also reads fine. What did I miss here? Thanks. mhr ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos Howdy, Just a thought, do you have the expat-devel package installed? Thanks, Finnur ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] f/oss routing solution?
I'm looking for an open source router solution, and someone from the list recently recommended zebra (www.zebra.org). I haven't yet identified all my needs, but I'm guessing that it will do all my routing needs for a, say, class C set of IP addresses, particularly if I ever have to do anything BGP-related. Anyone have any pointers before I delve in? Or possibly a recommendation for another open source routing solution? Yeah, I know about Cisco stuff, but I'm hoping to limp along on a shoestring budget until I get a few more things in place, then I'll rethink everything. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos Hi, You might also want to look at http://www.vyatta.org/ They seem to have a nice solution although i have not tried it. Bgrds, Finnur ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Migrating software raid from SUSE 9.0 to Centos 5
Dan Carl wrote: I forgot to add the file system is riserfs. -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Dan Carl Sent: Friday, January 04, 2008 5:43 PM To: centos@centos.org Subject: [CentOS] Migrating software raid from SUSE 9.0 to Centos 5 I have a SUSE 9.0 box with a software raid. It consists of 6 IDE drives and three different controllers The OS is on a separate drive. What I want to do is put a new boot drive in load Centos on it. Then I want to be able to mount the raid without loosing any of the data on it. What information do I need from the SUSE OS (raid info etc...) to tell Centos how to recognize it? The data is backup on DVD's but it would be a real pain to reload it.(its around a terabyte of data) So I'm writing here for some advice. I've setup many raids in the past but only fresh installs. Thanks ___ 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 Hi, It should not be any problem but you will have to install the kernel from the centosplus repository since the base kernel does not include support for reiserfs. Thanks, Finnur ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS] Qlogic HBA scanning issues with CentOS 5.1 ?
Hi, I got few servers (IBM HS20,HS21 blades, IBM xSeries 3650 others) connected to a dual fabric san throught Qlogic HBA's (23xx, 24xx). Multipathing is done with device-mapper-multipath. On CentOS 4.x i can scan for new scsi devices without any problems, get them up with multipathing use them without any problems. However, after i started installing CentOS 5.1 (did not notice this problem with CentOS 5) i cannot seem to rescan without huge problems. Sometimes when i rescan after presenting a new LUN to the server nothing is detected, and sometimes the device comes in without any problems at all. Sometimes i even loose some paths after rescanning.again, i had no problems at all with CentOS 4.x. I use the Qlogic script (Dynamic Target and LUN Discovery http://support.qlogic.com/support/EULATemplate/Template.aspx?TemplateID=9path=http://download.qlogic.com/ms/56614/ql-dynamic-tgt-lun-disc-2.2.tgz 2.2) to scan for new luns. Has anyone had any issues with scanning for new devices off san after upgrading to 5.1 ? Thanks, Finnur ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] apache mod_jk?
John Hinton wrote: Is this really not in CentOS 5? or maybe buried in javaland somewhere? thanks, John Hinton ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos Hi, You might want to take a look at mod_proxy_ajp instead. It comes with Apache 2.0/2.2 (and is included in the CentOS 5 httpd package). Thanks, Finnur ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] 10+ TB RAID experiences?
We are currently using few DS4700 without any problems at all. Management application gives us no crap:) Thanks, Finnur Tomasz Napierała wrote: On Wednesday 22 August 2007 17:31:37 Centos wrote: may I ask what kind of problem you had with IBM storages ? Regarding DS400 - many problem with management app freezing, forcing us to reset the array (sic!) With DS4300 hotswapping controllers broke whole array. Those are probably minor problems, but we never encountered such problems with 3PAR. Re, ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
