similar to: Libvirt lvm pool and external snapshot

Do you have some comparasion of IO performance on thin pool vs. qcow2 file on fs? In my case each VM would have its own thin volume. I just want to overcommit disk-space. Regards, Jan On 2017-11-07 13:16 +0300, Vasiliy Tolstov wrote: >Please don't use lvm thin for vm. In our hosting in Russia we have >100-150 vps on each node with lvm thin pool on ssd and have locks, >slowdowns

Hi all. I'm using libvirt 1.2.6 I want to use lvm storage for my virtual machines. But i want to use new lvm2 feature - thin pool. How can i do that in libvirt? If libvirt can't create it via pool xml, does (and how) to use this setup under libvirt? -- Vasiliy Tolstov, e-mail: v.tolstov@selfip.ru jabber: vase@selfip.ru

Please don't use lvm thin for vm. In our hosting in Russia we have 100-150 vps on each node with lvm thin pool on ssd and have locks, slowdowns and other bad things because of COW. After we switching to qcow2 files on plain ssd ext4 fs and happy =). 2017-11-04 23:21 GMT+03:00 Jan Hutař <jhutar@redhat.com>: > Hello, > as usual, I'm few years behind trends so I have learned

Hello, as usual, I'm few years behind trends so I have learned about LVM thin volumes recently and I especially like that your volumes can be "sparse" - that you can have 1TB thin volume on 250GB VG/thin pool. Is it somehow possible to use that with libvirt? I have found this post from 2014: https://www.redhat.com/archives/libvirt-users/2014-August/msg00010.html which says

On 08/02/2014 04:24 PM, Vasiliy Tolstov wrote: > Hi all. I'm using libvirt 1.2.6 > I want to use lvm storage for my virtual machines. > But i want to use new lvm2 feature - thin pool. How can i do that in > libvirt? If libvirt can't create it via pool xml, does (and how) to > use this setup under libvirt? > The 'Thin Pool' is avoided by libvirt, but volumes

I have lvm based (thin pool) storage on local disks. I need to move vps from one vg on one disk to another. Does it possible to migrate to localhost with blockcopy migration to another vg? I'm understand that i can move lv from one vg to another, but i don't need that. -- Vasiliy Tolstov, e-mail: v.tolstov@selfip.ru jabber: vase@selfip.ru

----- On Mar 9, 2018, at 4:39 PM, Bernd Lentes bernd.lentes@helmholtz-muenchen.de wrote: > Hi, > > i asked already a time ago about snapshots. I have some guests, each resides in > a raw file, placed on an ext3 fs which is on top of a logical volume, for each > guest a dedicated lv. > The raw is not a "must have", if there are obvious reasons i can convert them to

Hello. I'm very happy with libvirt and qemu, that great software! (after some playing i want to create golang bindings to libvirt).. Now i provide ext4 fs for qcow2 images (raid1 with two sata disks). Now i don't need live migration (but may need it in feature). What is the best way to provide disks to vm in case of performance, ability to create backups (i don't want lvm snapshots)?

Hi, i asked already a time ago about snapshots. I have some guests, each resides in a raw file, placed on an ext3 fs which is on top of a logical volume, for each guest a dedicated lv. The raw is not a "must have", if there are obvious reasons i can convert them to a qcow2. What i want is a consistent backup of each guest taken overnight. If possible i won't have downtime. I can use

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 <tru at centos.org>: > On Wed, Dec 02, 2015 at 08:53:39PM +0100, Axel Glienke wrote: >> Creating snapshot: >> >> [root at lvmtest ~]# lvcreate -L5G -s -n root_snap /dev/centos/root >> Reducing

Hi all, So I have an XFS file system within LVM which has an external log. My mount option in FSTAB is; /dev/vg_spock_data/lv_data /data xfs logdev=/dev/sdc1,nobarrier,logbufs=8,noatime,nodiratime 1 1 All is well no issues and very fast. Now I'd like to snapshot this bad boy and then run rsnapshot to create a few days backup. A snapshot volume is created w/o issue; lvcreate -L250G -s

We utilize LVM snapshots for some periodic maintenance. They're manually created and, usually, manually destroyed. But not always. So there's now a nightly script monitoring for open snapshots. Which raises the question of when a given snapshot was created. Absent good practices of, say, using sudo to create snapshots (leaving a /var/log/secure message), is there any reasonably

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 Zitat von Gordon Messmer <gordon.messmer at gmail.com>: > On 12/02/2015 11:09 AM,

Hi All, I am using xen (3.0.2)from some months and pretty happy with it. But i am afraid that xen kernel (2.6.16) has some limited support for lvm snapshot. I have two boxes with some domU and want to backup them on remote servers. I did this using lvm snapshot. First time it goes fine and backups created successfully. But second time when backup script was running in cron job, kernel through

On Tue, 03 Dec 2013 18:13:08 +0100 Oliver Brakmann <oliver.brakmann@posteo.de> wrote: > Hello, > > On 2013-11-22 21:46, Michael Mol wrote: > > I know that lvm supports thin provisioning, and I think I have a > > pretty good grasp on how that works. Does libvirt support lvm thin > > provisioning and thin snapshots? > > libvirt does not support storage pools

On Wed, Dec 02, 2015 at 08:53:39PM +0100, Axel Glienke wrote: > Creating snapshot: > > [root at 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 at lvmtest ~]# lvs > LV VG Attr LSize Pool Origin Data% Meta% Move > Log

Hi I have defined a logical pool and a volume within it # virsh vol-create-as images_lvm myvol 2G Vol myvol created # virsh vol-list images_lvm Name Path ----------------------------------------- myvol /dev/libvirt_images_vg/myvol if I try to create another volume using the previous one as backing-vol, the creation fails with what looks like an incorrect

Good m/d/n guys, wanted to put idea through you before trying to implement this. So afaik LVM snapshots basically don't take any "real" space on hard drives. I'm using KVM virtualization on my hosts and let's say i create an LVM volume for my linux VM, then install it properly, shut it down and take LVM snapshot of it. Basically i've just cloned it (LVM2 snapshots are

Creating snapshot: [root at 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 at lvmtest ~]# lvs LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert root centos owi-aos--- 2,93g root_snap centos swi-a-s--- 2,94g

Hello, I have a problem when uploading file to samba server when the share's volume is under lvm snapshot. I always got "The specified network name is no longer available", this happens when uploading large files like 500MB and the volume has a lvm snapshot(even 1 snapshot). If there are no snapshots, everything is ok, I can transfer large files without problem. my client is