Re: [Xen-users] Re: Data Backup and Restore Scripts for your Xen Servers

[Javier Guerra <javier@xxxxxxxxxxx>]

Steven Anderson wrote:
> I was trying to understand why one wouldnt use LV snapshots

because it gives you a backup of a 'dirty' filesystem.  that is, a snapshot 
when it's mounted, and without any guarantees about all processes having 
flushed important data to disk.

recovering from such a backup is to the system just like recovering from a 
'pull the plug' event.  In most cases an fsck is enough and the (little) lost 
data is within reason for a catastrophic failure.  In other cases (usually when 
a busy database is involved), it's just not OK,  you could recover data that is 
totally inconsistent, maybe needing a complex analysis to bring it back to a 
reasonable state.

IOW, it's better to use a 'normal' backup system, and be sure to get 
cooperation from any DB system.

-- 
Javier

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