Re: [Xen-users] iSCSI Volumes and Xen

["Nick Couchman" <Nick.Couchman@xxxxxxxxx>]

>>> On 2010/01/14 at 09:06, John Madden <jmadden@xxxxxxxxxxx> wrote: 
>>  Is the only backup option for a running domU to run a conventional backup
>> client within it, such as bacula?
> 
> If it were my data, I'd do conventional backups.  Others here report 
> success with snapshots, however, so I'll let them chime in.  I've never 
> looked into the xm save/restore stuff.
> 
> John
> 

Backups and Snapshots have different purposes and aren't mutually exclusive.  I 
use both - backups are stored on separate media so that if I lose my entire 
disk array I have a copy of the data, snapshots allow for quick recovery in the 
case of an operator error, application bug, guarding against rogue updates, 
etc.  ZFS's ability to send/receive may mitigate the separate storage issue 
usually associated with snapshots, as it will allow you to snapshot and then 
send that data to another array.  Also, even with conventional backups, you 
still need a way to halt transactions on your applications for long enough to 
be able to get a clean copy of the data.  The problem is the same for both 
snapshots and backups - in both cases, you either need to make sure that the 
application is capable of recovering from an unclean shutdown or that you're 
flushing everything to disk before you suck the data off.

-Nick



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