Re: [Xen-users] snapshots on xen

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Fri, Apr 09, 2010 at 08:57:16PM -0400, James Pifer wrote:
> Hi all. I'm using sles11 for my xen servers. I would really like to be
> able to do hot snapshots of disk AND memory, and then have these
> snapshots backed up to tape or off site for disaster recovery. I'm
> thinking this would be done weekly or monthly, not nightly.
> 
> Two questions:
> 
> 1) Is this even possible? 
>

1) xm save <guest> <guest>.save
2) save a copy of the guest disks
3) save a copy of the <guest>.save file
4) xm restore <guest>.save
 
Remember that for PV guests the guest kernel needs to have 
proper/working save/restore/migration support. SLES11 kernels should have.

> 2) I could probably have the systems shutdown to make a clean backups,
> but it would need to be fast. My current file system would take too
> long. 
> 
> 3) What cluster file system is supported? I have sles11 with a Xiotech
> SAN. I thought I could do this with CLVM, but just found out I can't. So
> how would I do it? (even if I have to shut the domU down first)
> 
> Right now I'm using ocfs2 and growable storage, which definitely doesn't
> support snapshots and copies take a pretty long time.
> 
> Suggestions are appreciated. 
> 

Hopefully that helps.

-- Pasi


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