[CentOS] lVM looking for a gui running from live-cd

Hallo, I m looking for a grafical interface for LVM running from a live cd (centos or other). Background: I not trained in resizing volumes using the cmd. Ralf ___ CentOS mailing list CentOS@centos.org

Re: [CentOS] LVM and thin snapshots

Hi , You can also check if BOOM boot manager can work with thin LVM. I really like that feature, since CentOS7.x Best Regards, Strahil NikolovOn Sep 27, 2019 12:39, Georgios wrote: > > Hi there! > > Im new here. > > Im trying to install Centos 8 on my laptop. I also want to have a >

[CentOS] LVM and thin snapshots

Hi there! Im new here. Im trying to install Centos 8 on my laptop. I also want to have a contingency plan in case something brakes. My first thoughts were to use LVM. The idea is that i would take multiple snapshots of the system during the day/week and will keep them for a short time. I read

Re: [CentOS] LVM failure after CentOS 7.6 upgrade -- possible corruption

On 12/5/18 8:34 PM, Gordon Messmer wrote: I still can't reason why the lvm tools were scanning the component volumes to begin with. I think I've figured it out. The new lvm-tools package appears to have broken support for detecting dm metadata version 0.90. The update should be stable for

Re: [CentOS] LVM failure after CentOS 7.6 upgrade -- possible corruption

On 12/5/18 9:27 AM, Gordon Messmer wrote: The content of /var/log/messages is here: https://paste.fedoraproject.org/paste/n-E6X76FWIKzIvzPOw97uw I don't have much new information, other than that I tested booting a similar system with an intentionally degraded RAID volume. That one

Re: [CentOS] LVM failure after CentOS 7.6 upgrade -- possible corruption

On 12/5/18 9:56 AM, Simon Matter wrote: When running "pvs" on the broken system, no RAID volumes were listed, only component devices After updating, look at the output of "pvs" if you use LVM on software RAID. What exactly did `pvs' show and instead of what? It should print: # pvs   PV   

Re: [CentOS] LVM failure after CentOS 7.6 upgrade -- possible corruption

On Wednesday, December 5, 2018 11:38:50 AM PST Stephen John Smoogen wrote: > You might want to point out which list you posted it on since it > doesn't seem to be this one. Apparently there's a size limit for emails. I've resent with one of the output files hosted on a personal webserver and it

Re: [CentOS] LVM failure after CentOS 7.6 upgrade -- possible corruption

On Wed, 5 Dec 2018 at 14:27, Benjamin Smith wrote: > > My gut feeling is that this is related to a RAID1 issue I'm seeing with 7.6. > See email thread "CentOS 7.6: Software RAID1 fails the only meaningful test" > You might want to point out which list you posted it on since it doesn't seem to be

Re: [CentOS] LVM failure after CentOS 7.6 upgrade -- possible corruption

My gut feeling is that this is related to a RAID1 issue I'm seeing with 7.6. See email thread "CentOS 7.6: Software RAID1 fails the only meaningful test" I suggest trying to boot from an earlier kernel. Good luck! Ben S On Wednesday, December 5, 2018 9:27:22 AM PST Gordon Messmer wrote: >

Re: [CentOS] LVM failure after CentOS 7.6 upgrade -- possible corruption

> I've started updating systems to CentOS 7.6, and so far I have one > failure. > > This system has two peculiarities which might have triggered the > problem. The first is that one of the software RAID arrays on this > system is degraded. While troubleshooting the problem, I saw similar > error

[CentOS] LVM failure after CentOS 7.6 upgrade -- possible corruption

I've started updating systems to CentOS 7.6, and so far I have one failure. This system has two peculiarities which might have triggered the problem. The first is that one of the software RAID arrays on this system is degraded. While troubleshooting the problem, I saw similar error messages

Re: [CentOS] LVM and Backups

On 9/18/18 11:55 PM, Alessandro Baggi wrote: I don't know why I considered pg_dump better then filesystem backup. At this moment I prefer pg_dump because in this mode I can restore data on different version of postgresql. With filesystem dump I can restore only for a specific version. Is

Re: [CentOS] LVM and Backups

Il 18/09/2018 17:14, Gordon Messmer ha scritto: On 9/17/18 11:38 PM, Alessandro Baggi wrote: Il 17/09/2018 22:12, Gordon Messmer ha scritto: That doesn't look right.  It should look more like 1) stop or freeze all of the services (httpd and database), 2) make the snapshot, 3) start or thaw

Re: [CentOS] LVM and Backups

On 9/17/18 11:38 PM, Alessandro Baggi wrote: Il 17/09/2018 22:12, Gordon Messmer ha scritto: That doesn't look right.  It should look more like 1) stop or freeze all of the services (httpd and database), 2) make the snapshot, 3) start or thaw all of the services, 4) mount the snapshot, 5) back

Re: [CentOS] LVM and Backups

Il 17/09/2018 22:12, Gordon Messmer ha scritto: On 9/17/18 7:50 AM, Alessandro Baggi wrote: Running a backup I follow this steps: 1) Stop httpd 2) Create lvm snapshot on the dataset 3) Backup database 4) restart httpd (to avoid more downtime) 5) mount the snapshot and execute backup 6) umount

Re: [CentOS] LVM and Backups

On 9/17/18 7:50 AM, Alessandro Baggi wrote: Running a backup I follow this steps: 1) Stop httpd 2) Create lvm snapshot on the dataset 3) Backup database 4) restart httpd (to avoid more downtime) 5) mount the snapshot and execute backup 6) umount and remove the snapshot I think that this could

[CentOS] LVM and Backups

Hey there, I'm testing LVM snapshot to make backups and I've some questions about snapshot lvm. In my test case I have httpd, postgresql db and a dataset on a VM. Running a backup I follow this steps: 1) Stop httpd 2) Create lvm snapshot on the dataset 3) Backup database 4) restart httpd (to

Re: [CentOS] LVM problems

On Tue, Jul 3, 2018 at 10:25 AM, John Hodrien wrote: > On Tue, 3 Jul 2018, Thomas Schweikle wrote: > >> On Mon, Jul 2, 2018 at 7:53 PM, Ulf Volmer wrote: >>> >>> On 02.07.2018 18:23, Thomas Schweikle wrote: >>> System boots into emergency mode because it does not find any of the

Re: [CentOS] LVM problems

On Tue, 3 Jul 2018, Thomas Schweikle wrote: On Mon, Jul 2, 2018 at 7:53 PM, Ulf Volmer wrote: On 02.07.2018 18:23, Thomas Schweikle wrote: System boots into emergency mode because it does not find any of the logical volumes defined, because it does not enable the LVM volume group. Giving

Re: [CentOS] LVM problems

On Mon, Jul 2, 2018 at 7:53 PM, Ulf Volmer wrote: > On 02.07.2018 18:23, Thomas Schweikle wrote: > >> System boots into emergency mode because it does not find any of the >> logical volumes defined, because it does not enable the LVM volume >> group. >> >> Giving "lvm", then "vgchange -a y",

Re: [CentOS] LVM problems

On 02.07.2018 18:23, Thomas Schweikle wrote: > System boots into emergency mode because it does not find any of the > logical volumes defined, because it does not enable the LVM volume > group. > > Giving "lvm", then "vgchange -a y", followed by CTRL-D continues to > boot to full multiuser mode.

[CentOS] LVM problems

Hi! Folowing setup: 4x HD 500TB 1st: /boot 4GB, remaining part LVM 2nd, 3rd, 4th all LVM LVM volumes: - 30G /root - 8G /var - 8G /tmp - 200G /var/log/pgsql - 800G /var/spacewalk - 4G swap System boots into emergency mode because it does not find any of the logical volumes defined, because it

Re: [CentOS] LVM GUI in live CD

On 05/22/18 11:07 UTC, Miguel González wrote: > > Still, I´m talking about any known live CD which contains system-config-lvm > or any other GUI tool. > The 'live' download of GParted v0.31 (gparted.org/download.php - 64-bit ISO = ~318MiB) says it does LVM2 now... the latest available for

Re: [CentOS] LVM GUI in live CD

On 05/21/18 11:07 PM, Mike Burger wrote: > On 2018-05-21 4:33 pm, Miguel Gonzalez wrote: >> Hi, >> >>   I am searching around and I can´t find any GUI LVM manager included in >> a Centos live CD. >> >>   I am trying to resize a LVM partition in a Centos 6.9 machine with a >> live CD. >> >>   If I

Re: [CentOS] LVM GUI in live CD

Another idea is Fedora 27 or 28 live media, and 'dnf install blivet-gui' Chris Murphy ___ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos

Re: [CentOS] LVM GUI in live CD

On 2018-05-21 4:33 pm, Miguel Gonzalez wrote: Hi,   I am searching around and I can´t find any GUI LVM manager included in a Centos live CD.   I am trying to resize a LVM partition in a Centos 6.9 machine with a live CD.   If I need any other distro, It´s fine with me   Thanks!   Miguel

[CentOS] LVM GUI in live CD

Hi,   I am searching around and I can´t find any GUI LVM manager included in a Centos live CD.   I am trying to resize a LVM partition in a Centos 6.9 machine with a live CD.   If I need any other distro, It´s fine with me   Thanks!   Miguel   ___

Re: [CentOS] LVM not activating on reboot

On 05/10/2017 12:10, Anthony K wrote: It might require a vgexport then vgimport to fix. On 03/10/2017 21:28, Gordon Messmer wrote: Is /etc/mdadm.conf up to date?  Run "mdadm --detail --scan" to get the information you need, and either replace the lines in mdadm.conf or add the one that's

Re: [CentOS] LVM not activating on reboot

On 01/10/17 11:25, Duncan Brown wrote: No joy after adding the kernel option, exactly the same issue It might require a vgexport then vgimport to fix. vgimport man page: DESCRIPTION    vgimport allows you to make a Volume Group that was previously exported    using  vgexport(8) 

Re: [CentOS] LVM not activating on reboot

On 09/30/2017 05:25 PM, Duncan Brown wrote: No joy after adding the kernel option, exactly the same issue Is /etc/mdadm.conf up to date?  Run "mdadm --detail --scan" to get the information you need, and either replace the lines in mdadm.conf or add the one that's missing.  You might need to

Re: [CentOS] LVM not activating on reboot

On 30/09/2017 17:49, Gordon Messmer wrote: On 09/30/2017 08:30 AM, Duncan Brown wrote: However on a reboot, boot fails if I add that entry to fstab: 'Timed out waiting for device dev-mapper-vg03\x2dstorage.device' I then have to activate it again with vgchange. I'm guessing I'm going to need

Re: [CentOS] LVM not activating on reboot

On 09/30/2017 08:30 AM, Duncan Brown wrote: However on a reboot, boot fails if I add that entry to fstab: 'Timed out waiting for device dev-mapper-vg03\x2dstorage.device' I then have to activate it again with vgchange. I'm guessing I'm going to need a grub option, or do something with dracut

[CentOS] LVM not activating on reboot

Hi I've recently rebuilt my home server using centos 7, and transplanted over the main storage disks It's a 3 disk raid5, with an lvm storage group (vg03) on there Activating and mounting works fine: # vgscan   Reading volume groups from cache.   Found volume group "vg03" using metadata

[CentOS] LVM appears to be very expensive on CentOS 7

After running a long series of benchmarks, it looks like there is a very significant performance difference between systems using LVM and systems not using LVM under CentOS 7. I'd appreciate it if anyone else can confirm these results. There are a couple of other surprising aspects of the

Re: [CentOS] LVM thin volumes fstrim operation not supported

My guess? The passthrough is causing the error when the command passes through to the actual device, which doesn't support Trim. I don't know how it actually works, but you can try to poke it with this stick: copy a large file to this LV. Check the LV with lvdisplay. Delete the file. Fstrim.

[CentOS] LVM thin volumes fstrim operation not supported

Hi All I'm trying to setup my LVM thin pool to support discards so that the pool can reclaim space even if the underlying device doesn't support trim. It is my understanding that all thin pools should support trim even if the underlying device doesn't. (please correct me if I'm wrong here) I

Re: [CentOS] LVM thin volumes fstrim operation not supported

Looked into this further and it looks like a kernel bug. If I downgraded the running kernel everything started working again. I've reported here https://bugs.centos.org/view.php?id=10191 with some more details. Thanks On 20 January 2016 at 11:36, Tim Robinson wrote: > I

Re: [CentOS] LVM thin volumes fstrim operation not supported

I still get the "the discard operation is not supported" fstrim error when the LVs are set to "nopassdown" Seems that when I use ext4 the fstrim reports that it worked but the LVs Data% does not decrease after the fstrim. xfs just throws the error. I've also been looking at the output of lsblk

Re: [CentOS] lvm snapshot

in journalctl i found: modprobe: FATAL: Module dm-snapshot not found ... Can't process LV root_snap: snapshot target support missing from kernel Zitat von Tru Huynh : On Wed, Dec 02, 2015 at 08:53:39PM +0100, Axel Glienke wrote: Creating snapshot: [root@lvmtest ~]# lvcreate

Re: [CentOS] lvm snapshot

On 12/02/2015 11:09 AM, Axel Glienke wrote: after a lvm snapshot creation and a reboot are all logical volumes are missing, only swap is present. What release is that? And what does /proc/cmdline contain when the system boots to the dracut shell?

Re: [CentOS] lvm snapshot

Creating snapshot: [root@lvmtest ~]# lvcreate -L5G -s -n root_snap /dev/centos/root Reducing COW size 5,00 GiB down to maximum usable size 2,94 GiB. Logical volume "root_snap" created. [root@lvmtest ~]# lvs LVVG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync

[CentOS] lvm snapshot

Hello after a lvm snapshot creation and a reboot are all logical volumes are missing, only swap is present. lvcreate -L 5000M -s -n centos_h1-root_snap /dev/mapper/centos_h1-root lvs LV VGAttr LSizePool Origin Data% Meta% Move Log

Re: [CentOS] lvm snapshot

Ok, kernel needs the module dm-snapshot for snapshot support, but the modules is storage on a snapshoted-lv ... you can't make a root_snapshot with centos? Zitat von Axel Glienke : in journalctl i found: modprobe: FATAL: Module dm-snapshot not found ... Can't process LV

Re: [CentOS] lvm snapshot

sorry: centos7 "fresh" minimal with a actual update cat proc/cmdline: BOOT_IMAGE=/vmlinuz-3.10.0-229.20.1.el7.x86_64 root=/dev/mapper/centos_root ro rd.lvm.lv=centos/root rd.lvm.lv=centos/swap crashkernel=auto rhgb quiet LANG=de_DE.UTF-8 systemd.debug ls /dev/mapper: centos-swap control

Re: [CentOS] lvm snapshot

On Wed, Dec 02, 2015 at 08:53:39PM +0100, Axel Glienke wrote: > Creating snapshot: > > [root@lvmtest ~]# lvcreate -L5G -s -n root_snap /dev/centos/root > Reducing COW size 5,00 GiB down to maximum usable size 2,94 GiB. > Logical volume "root_snap" created. > [root@lvmtest ~]# lvs > LV

Re: [CentOS] lvm snapshot

ok, thank you very much Gordon. but you know what the difference? if i do 1. centos7 installation 2. yum upgrade 3. lvcreate -s ... 4. reboot then i got the error. if i do your way 1. centos7 installtion 2. snapshot & reboot 3. yum upgrade 4. reboot then the system start. Zitat von Gordon

Re: [CentOS] lvm snapshot

On 12/02/2015 02:02 PM, Axel Glienke wrote: ok, thank you very much Gordon. but you know what the difference? if i do 1. centos7 installation 2. yum upgrade 3. lvcreate -s ... 4. reboot then i got the error. I'll try to recreate the problem on a new VM, but that doesn't make much sense.

Re: [CentOS] lvm snapshot

LVM is terribly flawed and most imprudent piece of any filesystem that you can have for snapshot'ing! The only snapshot-friendly filesystem or volume manager is ZFS. Whether create a single snapshot or few hundred thousand. It is instant and no data is lost. On Thu, Dec 3, 2015 at 12:09 AM, Axel

Re: [CentOS] lvm snapshot

On 12/02/2015 12:05 PM, Axel Glienke wrote: in journalctl i found: modprobe: FATAL: Module dm-snapshot not found ... Can't process LV root_snap: snapshot target support missing from kernel I installed a very simple CentOS 7 system with an LVM root FS. Created a snapshot and rebooted, no

Re: [CentOS] lvm snapshot

https://bugzilla.redhat.com/show_bug.cgi?id=1287940 I'm not sure what I saw that made me think the entire drivers/md tree was included. I deleted the first VM that I used to investigate the problem, so I can't look at the shell history to figure that one out. In any case, that's not what

Re: [CentOS] lvm snapshot

On 12/02/2015 02:48 PM, Gordon Messmer wrote: I'll try to recreate the problem on a new VM, but that doesn't make much sense. Including the required module isn't dependent on creating the snapshot as far as I can tell. Crazy pants. I can reproduce the problem now. I don't know what the

Re: [CentOS] lvm snapshot

a manually dracut -f --add-drivers "dm-snapshot" solve the problem Zitat von Gordon Messmer : On 12/02/2015 02:48 PM, Gordon Messmer wrote: I'll try to recreate the problem on a new VM, but that doesn't make much sense. Including the required module isn't dependent

[CentOS] LVM - how to change lv from linear to stripped? Is it possible?

Hi All. Currently I am trying to change a logical volume from linear to stripped because I would like to have a better write throughput. I would like to perform this change "live" without stopping access to this lv. I have found two interesting examples:

[CentOS] LVM - stripped logical volumes by default?

Hi All. I am currently using OpenStack Juno on CentOS 7. The problem is that by default OpenStack's Cinder service creates logical volumes of "linear" type. I would like to have them stripped over all physical disks to get better write performance. Is there a way to tell LVM to create by default

Re: [CentOS] LVM hatred, was Re: /boot on a separate partition?

On Wed, 24 Jun 2015 14:06:19 -0500 Chris Adams li...@cmadams.net wrote: Now, if btrfs ever gets all the kinks worked out (and has a stable fsck for the corner cases), it integrates volume management into the filesystem, which makes some of the management easier. I used AdvFS on

Re: [CentOS] LVM hatred, was Re: /boot on a separate partition?

On Fri, Jun 26, 2015 at 4:47 AM, Steve Clark scl...@netwolves.com wrote: On 06/25/2015 06:44 PM, Chris Murphy wrote: I did a bunch of testing of Raw, qcow2, and LV backed VM storage circa Fedora 19/20 and found very little difference. What mattered most was the (libvirt) cache setting,

Re: [CentOS] LVM hatred, was Re: /boot on a separate partition?

Am 26.06.2015 um 12:47 schrieb Steve Clark scl...@netwolves.com: On 06/25/2015 06:44 PM, Chris Murphy wrote: Gordon Messmer gordon.messmer at gmail.com Wed Jun 24 01:42:13 UTC 2015 I wondered the same thing, especially in the context of someone who prefers virtual machines. LV-backed VMs

Re: [CentOS] LVM hatred, was Re: /boot on a separate partition?

On 06/26/2015 07:58 AM, Mark Milhollan wrote: On Wed, 24 Jun 2015, Gordon Messmer wrote: 1) If you have a system with a single disk, you have to reboot to add partitions for new guests. Linux won't refresh the partition table on the disk it boots from. I'm not sure this is still true, but I

Re: [CentOS] LVM hatred, was Re: /boot on a separate partition?

On Fri, Jun 26, 2015 at 10:51 AM, Gordon Messmer gordon.mess...@gmail.com wrote: , or alternatively making the LVs redundant after install is a single command (each) and you can choose whether it should be mere mirroring or some MD manged RAID level (modulo the LVM RAID MD monitoring issue).

Re: [CentOS] LVM hatred, was Re: /boot on a separate partition?

On 6/26/2015 12:34 PM, Chris Murphy wrote: At the moment, LVM RAID is only supported with conventional/thick provisioning. So if you want to do software RAID and also use LVM thin provisioning, you still need to use mdadm (or hardware RAID). You can do thin pools as RAID[1,5,N], just not

Re: [CentOS] LVM hatred, was Re: /boot on a separate partition?

On 06/25/2015 06:44 PM, Chris Murphy wrote: Gordon Messmer gordon.messmer at gmail.com Wed Jun 24 01:42:13 UTC 2015 I wondered the same thing, especially in the context of someone who prefers virtual machines. LV-backed VMs have *dramatically* better disk performance than file-backed VMs. I

Re: [CentOS] LVM hatred, was Re: /boot on a separate partition?

On 06/25/2015 01:20 PM, Chris Adams wrote: ...It's basically a way to assemble one arbitrary set of block devices and then divide them into another arbitrary set of block devices, but now separate from the underlying physical structure. Regular partitions have various limitations (one big

Re: [CentOS] LVM hatred, was Re: /boot on a separate partition?

On 06/23/2015 01:54 PM, Marko Vojinovic wrote: So the story ended up with lots of people in upgrading griefs purely because they couldn't resize the separate /boot partition, and it was separate because LVM was present, and LVM was present with the goal of making partition resizing easy! A

Re: [CentOS] LVM hatred, was Re: /boot on a separate partition?

On 6/24/2015 3:11 PM, Chuck Campbell wrote: Is there an easy to follow howto for normal LVM administration tasks. I get tired of googling every-time I have to do something I don't remember how to do regarding LVM, so I usually just don't bother with it at all. I believe it has some benefit

Re: [CentOS] LVM hatred, was Re: /boot on a separate partition?

At Thu, 25 Jun 2015 11:03:18 -0400 CentOS mailing list centos@centos.org wrote: On Wed, June 24, 2015 16:11, Chuck Campbell wrote: Is there an easy to follow howto for normal LVM administration tasks. I get tired of googling every-time I have to do something I don't remember how to

Re: [CentOS] LVM hatred, was Re: /boot on a separate partition?

On Wed, June 24, 2015 16:11, Chuck Campbell wrote: Is there an easy to follow howto for normal LVM administration tasks. I get tired of googling every-time I have to do something I don't remember how to do regarding LVM, so I usually just don't bother with it at all. I believe it has some

Re: [CentOS] LVM hatred, was Re: /boot on a separate partition?

James B. Byrne wrote: On Wed, June 24, 2015 16:11, Chuck Campbell wrote: Is there an easy to follow howto for normal LVM administration tasks. I get tired of googling every-time I have to do something I don't remember how to do regarding LVM, so I usually just don't bother with it at all.

Re: [CentOS] LVM hatred, was Re: /boot on a separate partition?

On 06/25/2015 11:03 AM, James B. Byrne wrote: On Wed, June 24, 2015 16:11, Chuck Campbell wrote: Is there an easy to follow howto for normal LVM administration tasks. I get tired of googling every-time I have to do something I don't remember how to do regarding LVM, so I usually just don't

Re: [CentOS] LVM hatred, was Re: /boot on a separate partition?

On Tue, 2015-06-23 at 11:15 -0500, Jason Warr wrote: On 6/23/2015 10:33 AM, Marko Vojinovic wrote: Inside / (which is mostly always ext4), 100% of the time. :-) That said, I prefer virtual machines over multiboot environments, and I absolutely despise LVM --- that cursed thing is never

Re: [CentOS] LVM hatred, was Re: /boot on a separate partition?

Robert Heller wrote: At Thu, 25 Jun 2015 11:03:18 -0400 CentOS mailing list centos@centos.org wrote: On Wed, June 24, 2015 16:11, Chuck Campbell wrote: Is there an easy to follow howto for normal LVM administration tasks. I get tired of googling every-time I have to do something I don't

Re: [CentOS] LVM hatred, was Re: /boot on a separate partition?

Once upon a time, Adam Tauno Williams awill...@whitemice.org said: There may be numerous commands... but isn't it pretty obvious what each one of them do? Often lvtabtab is plenty of hinting to get to the right thing. And each of the commands uses the same syntax for options. The key thing

Re: [CentOS] LVM hatred, was Re: /boot on a separate partition?

On Thu, 2015-06-25 at 11:50 -0400, Robert Heller wrote: At Thu, 25 Jun 2015 11:03:18 -0400 CentOS mailing list centos@centos.org wrote:HA! You only really need to learn *one* command: the man command. The man provides 'enlightenment' for all other commands: man vgdisplay man lvdisplay

Re: [CentOS] LVM hatred, was Re: /boot on a separate partition?

On Thu, Jun 25, 2015 at 10:49:57AM -0500, Jason Warr wrote: On 6/24/2015 3:11 PM, Chuck Campbell wrote: Is there an easy to follow howto for normal LVM administration tasks. I get tired of googling every-time I have to do something I don't remember how to do regarding LVM, so I usually

Re: [CentOS] LVM hatred, was Re: /boot on a separate partition?

On Thu, June 25, 2015 11:59 am, Scott Robbins wrote: On Thu, Jun 25, 2015 at 10:49:57AM -0500, Jason Warr wrote: On 6/24/2015 3:11 PM, Chuck Campbell wrote: Is there an easy to follow howto for normal LVM administration tasks. I get tired of googling every-time I have to do something I

Re: [CentOS] LVM hatred, was Re: /boot on a separate partition?

On 6/25/2015 8:50 AM, Robert Heller wrote: man vgdisplay man lvdisplay man lvcreate man lvextend man lvresize man lvreduce man lvremove man e2fsck man resize2fs man xfs_growfs -- john r pierce, recycling bits in santa cruz ___ CentOS mailing list

Re: [CentOS] LVM hatred, was Re: /boot on a separate partition?

At Thu, 25 Jun 2015 13:18:04 -0400 CentOS mailing list centos@centos.org wrote: Robert Heller wrote: At Thu, 25 Jun 2015 11:03:18 -0400 CentOS mailing list centos@centos.org wrote: On Wed, June 24, 2015 16:11, Chuck Campbell wrote: Is there an easy to follow howto for normal LVM

Re: [CentOS] LVM hatred, was Re: /boot on a separate partition?

John R Pierce wrote: On 6/25/2015 11:12 AM, James A. Peltier wrote: You forgot man this opinion thread is getting really long No manual entry for this opinion thread is getting really long That's obviously not the case: it's *all* manual entry of text g mark

Re: [CentOS] LVM hatred, was Re: /boot on a separate partition?

- Original Message - | On 6/25/2015 8:50 AM, Robert Heller wrote: | man vgdisplay | man lvdisplay | man lvcreate | man lvextend | man lvresize | man lvreduce | man lvremove | man e2fsck | man resize2fs | | man xfs_growfs You forgot man this opinion thread is getting really long

Re: [CentOS] LVM hatred, was Re: /boot on a separate partition?

On Thu, Jun 25, 2015 at 12:05:13PM -0500, Valeri Galtsev wrote: On Thu, June 25, 2015 11:59 am, Scott Robbins wrote: On Thu, Jun 25, 2015 at 10:49:57AM -0500, Jason Warr wrote: AFAIK, your page exists forever. This is how I first learned LVM: from your page. (Not that I use LVM much,

Re: [CentOS] LVM hatred, was Re: /boot on a separate partition?

On Thu, June 25, 2015 12:18 pm, m.r...@5-cent.us wrote: Robert Heller wrote: At Thu, 25 Jun 2015 11:03:18 -0400 CentOS mailing list centos@centos.org wrote: On Wed, June 24, 2015 16:11, Chuck Campbell wrote: Is there an easy to follow howto for normal LVM administration tasks. I get

Re: [CentOS] LVM hatred, was Re: /boot on a separate partition?

On 6/25/2015 11:12 AM, James A. Peltier wrote: You forgot man this opinion thread is getting really long No manual entry for this opinion thread is getting really long -- john r pierce, recycling bits in santa cruz ___ CentOS mailing list

[CentOS] LVM hatred, was Re: /boot on a separate partition?

Gordon Messmer gordon.messmer at gmail.com Wed Jun 24 01:42:13 UTC 2015 I wondered the same thing, especially in the context of someone who prefers virtual machines. LV-backed VMs have *dramatically* better disk performance than file-backed VMs. I did a bunch of testing of Raw, qcow2, and

[CentOS] LVM hatred, was Re: /boot on a separate partition?

Mike - st257 silvertip257 at gmail.com Tue Jun 23 16:40:47 UTC 2015 On Tue, Jun 23, 2015 at 12:15 PM, Jason Warr jason at warr.net wrote: I'm curious what has made some people hate LVM so much. I have been using it for years on thousands of No clue. My experiences with LVM have been

[CentOS] LVM hatred, was Re: /boot on a separate partition?

Chris Adams linux at cmadams.net Wed Jun 24 19:06:19 UTC 2015 Btrfs may eventually obsolete a lot of uses of LVM, but that's down the road. LVM is the emacs of storage. It'll be here forever. Btrfs doesn't export (virtual) block devices like LVM can, so it can't be a backing for say iSCSI. And

[CentOS] LVM hatred, was Re: /boot on a separate partition?

Chris Adams linux at cmadams.net Wed Jun 24 13:14:34 UTC 2015 There are plenty of people that have documented the performance differences, just Google it. This is consistent with what I've experienced. Minimal difference. http://web-docs.gsi.de/~tstibor/iozone/qcow.vs.lvm/ -- Chris Murphy

Re: [CentOS] LVM hatred, was Re: /boot on a separate partition?

At Wed, 24 Jun 2015 14:06:30 -0400 CentOS mailing list centos@centos.org wrote: Gordon Messmer wrote: On 06/23/2015 08:10 PM, Marko Vojinovic wrote: Ok, you made me curious. Just how dramatic can it be? From where I'm sitting, a read/write to a disk takes the amount of time it takes,

Re: [CentOS] LVM hatred, was Re: /boot on a separate partition?

On Wed, 24 Jun 2015 10:40:59 -0700 Gordon Messmer gordon.mess...@gmail.com wrote: On 06/23/2015 08:10 PM, Marko Vojinovic wrote: For concreteness, let's say I have a guest machine, with a dedicated physical partition for it, on a single drive. Or, I have the same thing, only the

Re: [CentOS] LVM hatred, was Re: /boot on a separate partition?

At Wed, 24 Jun 2015 04:10:35 +0100 CentOS mailing list centos@centos.org wrote: On Tue, 23 Jun 2015 18:42:13 -0700 Gordon Messmer gordon.mess...@gmail.com wrote: I wondered the same thing, especially in the context of someone who prefers virtual machines. LV-backed VMs have

Re: [CentOS] LVM hatred, was Re: /boot on a separate partition?

Once upon a time, Marko Vojinovic vvma...@gmail.com said: On Tue, 23 Jun 2015 18:42:13 -0700 Gordon Messmer gordon.mess...@gmail.com wrote: I wondered the same thing, especially in the context of someone who prefers virtual machines. LV-backed VMs have *dramatically* better disk

Re: [CentOS] LVM hatred, was Re: /boot on a separate partition?

On Tue, 23 Jun 2015, John R Pierce wrote: While it has the same concepts, physical volumes, volume groups, logical volumes, the LVM in AIX shares only the initials with Linux. I've heard that Linux's LVM was based on HP-UX's design. Sure, and IRIX had a similar concept, although my

Re: [CentOS] LVM hatred, was Re: /boot on a separate partition?

On 06/23/2015 09:00 PM, Marko Vojinovic wrote: On Tue, 23 Jun 2015 19:08:24 -0700 Gordon Messmer gordon.mess...@gmail.com wrote: 1) LVM makes MBR and GPT systems more consistent with each other, reducing the probability of a bug that affects only one. 2) LVM also makes RAID and non-RAID systems

Re: [CentOS] LVM hatred, was Re: /boot on a separate partition?

Gordon Messmer wrote: On 06/23/2015 08:10 PM, Marko Vojinovic wrote: Ok, you made me curious. Just how dramatic can it be? From where I'm sitting, a read/write to a disk takes the amount of time it takes, the hardware has a certain physical speed, regardless of the presence of LVM. What am I

Re: [CentOS] LVM hatred, was Re: /boot on a separate partition?

On 06/24/2015 11:06 AM, m.r...@5-cent.us wrote: Here's a question: all of the arguments you're giving have to do with VMs. Do you have some for straight-on-the-server, non-VM cases? Marko sent two messages and suggested that we keep the VM performance question as a reply to that one. My

Re: [CentOS] LVM hatred, was Re: /boot on a separate partition?

On 06/23/2015 08:10 PM, Marko Vojinovic wrote: Ok, you made me curious. Just how dramatic can it be? From where I'm sitting, a read/write to a disk takes the amount of time it takes, the hardware has a certain physical speed, regardless of the presence of LVM. What am I missing? Well, there's

Re: [CentOS] LVM hatred, was Re: /boot on a separate partition?

On 06/24/2015 12:06 PM, Chris Adams wrote: LVM snapshots make it easy to get point-in-time consistent backups, including databases. For example, with MySQL, you can freeze and flush all the databases, snapshot the LV, and release the freeze. Exactly. And I mention this from time to time...

Re: [CentOS] LVM hatred, was Re: /boot on a separate partition?

On 06/24/2015 12:35 PM, Gordon Messmer wrote: Interesting. I wasn't aware that LVM had that option. I've been looking at bcache and dm-cache. I'll have to look into that as well. heh. LVM cache *is* dm-cache. Don't I feel silly. ___ CentOS

Re: [CentOS] LVM hatred, was Re: /boot on a separate partition?

On 6/24/2015 2:06 PM, Chris Adams wrote: Once upon a time, m.r...@5-cent.us m.r...@5-cent.us said: Here's a question: all of the arguments you're giving have to do with VMs. Do you have some for straight-on-the-server, non-VM cases? I've used LVM on servers with hot-swap drives to migrate to

Re: [CentOS] LVM hatred, was Re: /boot on a separate partition?

Once upon a time, m.r...@5-cent.us m.r...@5-cent.us said: Here's a question: all of the arguments you're giving have to do with VMs. Do you have some for straight-on-the-server, non-VM cases? I've used LVM on servers with hot-swap drives to migrate to new storage without downtime a number of

Re: [CentOS] LVM hatred, was Re: /boot on a separate partition?

On 6/24/2015 1:06 PM, m.r...@5-cent.us wrote: Gordon Messmer wrote: On 06/23/2015 08:10 PM, Marko Vojinovic wrote: Ok, you made me curious. Just how dramatic can it be? From where I'm sitting, a read/write to a disk takes the amount of time it takes, the hardware has a certain physical speed,

[CentOS] LVM hatred, was Re: /boot on a separate partition?

On 6/23/2015 10:33 AM, Marko Vojinovic wrote: Inside / (which is mostly always ext4), 100% of the time. :-) That said, I prefer virtual machines over multiboot environments, and I absolutely despise LVM --- that cursed thing is never getting on my drives. Never again, that is... I'm curious

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