[PVE-User] LVM Snapshot on Proxmox 2.2

Alain Péan alain.pean at lpn.cnrs.fr
Thu Feb 14 15:33:08 CET 2013


Hello,

Yes, it's right, you need only the space to store the changes. By 
default, I think  Proxmox ve 1.x installation leaved 4 GB of empty space 
in volume group, but it may be insufficient if backup takes time, or if 
the VM is heavily used. It seems that in PVE 2.2, Proxmox installation 
leaves 16 GB :
root at proxmoxtest00:~# vgdisplay
   --- Volume group ---
   VG Name               pve
   System ID
   Format                lvm2
....
   VG Size               297.59 GiB
   PE Size               4.00 MiB
   Total PE              76183
   Alloc PE / Size       72088 / 281.59 GiB
   Free  PE / Size       4095 / 16.00 GiB

Alain

Le 14/02/2013 15:17, Mark Ehle a écrit :
> I might be wrong, but I am under the impression that the spare space 
> only has to equal the changes that take place between the snapshot and 
> the filesystem while the snapshot exists.
>
>
> On Thu, Feb 14, 2013 at 4:52 AM, Daniel Vuilleumier <vui at bitnpixel.com 
> <mailto:vui at bitnpixel.com>> wrote:
>
>     Hello
>
>     Does anybody know whether the "live snapshot" requires us to have
>     empty space on the logical volume group in both cases: local
>     backup and backup to NFS?
>
>     For example:
>     My LVM is 1.8TB (maximum size on HW-RAID10).
>     I want to live snapshot a 100GB Container.
>
>     Do I have to shrink the logical volume to 1.7TB in order to get
>     the snapshot done without downtime?
>
>     In Proxmox 1.9 this used to be the case, does it still apply to
>     2.2 (and forthcomeing 2.3)?
>
>     Regards
>     Daniel Vuilleumier
>     Zurich, Switzerland
>
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