Le 04/07/2016 à 14:01, Smith, Graham - Computing Technical Officer a écrit :
>
> I don't use xenserver but my generic advice as a strategy would be to
> backup the contents of the VMs rather than the raw virtual disks.
>
> Effetively treating the guests as if they were physical systems. The
> raw virtual disk files will be large but also non-unique so will cost
> a lot more
>
> in storage space in your backups and potentially take a lot more time
> to backup. Backing up the files contained within the VMs should save
> space
>
> with BackupPC in taking full advantage of single instance storage of
> repeated files in your pool common to many users or host systems.
>
You can have both: save full image while storing only the delta between
two backups.
Here's what I've written:
http://gitweb.firewall-services.com/?p=virt-backup;a=blob_plain;f=virt-backup;hb=HEAD
I use it only on KVM, but should work with anything libvirt supports. I
use it in combination with BackupPC (as pre dump and post dump script)
The basic idea is:
- Suspend the VM
- take a snapshot of the underlying storage (using LVM)
- Resume the VM (so it has only been suspended for a very short time,
usually not even noticeable)
- Using chunkfs, mount the image (file or raw block) as a set of chunks
of fixed size: there's no copy, the fuse mount point is virtual, and
ready from it will read in fact from the snapshot, except that it'll be
pesented as a set of small chunks
- Using BackupPC, backup all those chunks
- When done, unmount the fuse file system and remove the snapshot
Now, the next backup will only store chunks which have changed, which is
usually not a lot
++
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*Daniel Berteaud*
FIREWALL-SERVICES SAS.
Société de Services en Logiciels Libres
Tel : 05 56 64 15 32
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/www.firewall-services.com/
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