Re: [Xen-users] Backup running Windows machines - redundancy

["Fajar A. Nugraha" <list@xxxxxxxxx>]

On Fri, Feb 11, 2011 at 4:19 PM, Bart Coninckx <bart.coninckx@xxxxxxxxxx> wrote:

On Friday 11 February 2011 09:56:47 Fajar A. Nugraha wrote:
> On Fri, Feb 11, 2011 at 3:50 PM, Paul Piscuc <paul.piscuc@xxxxxxxxxx> wrote:
> > Again, the purpose of this thread is to find an incremental backup
> > solution. DD and other methods work fine, but you cannot do daily backups
> > on 8 machines with 100GB storage, and keep those backups for a week or
> > more. Also, if one would like to restore a single file from the image,
> > things will get ugly.
>
> The "easy" solution form your problem is zfs :)
>
> Have you considered using a separate storage server, with
> nexenta/solaris/whatever-os-that-supports-zfs, and exporting them to your
> dom0 using iscsi?

Fajar,

you mean because of it's snapshotting capabilities?

snapshot and clone, to be exact.

�

Would you have the DomU
live on this filesystem and snapshot it like that?

domU will use zvol as a block device (instead of the usual LVM or partition).

The zvol can be on the on the dom0 (if you're "brave" enough to use zfsonlinux) or iscsi-imported from the storage server (which can run any OS that officially support zfs).

�

�Does this work faster than

LVM snapshots (I noticed a horrible performance drop)?

The performance drop will be there (compared to LVM), but it might or might not be acceptible depending on your needs.

If you want a supported system (and possibly someone which can help you size your system to meet your I/O performance needs) then a separate storage using nexenta/Sun Unified Storage (or even netapp) might be better.

And what about the
problem of integrity?

If you're already using lvm snapshot, then the consistency/integrity is the same.

If the application can recover a power failure, then it can recover it's data using the snapshot/clone.

--�

Fajar

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