Re: [Xen-users] Convert CentOS system to Xen image?

[Igor Chubin <igor@xxxxxxx>]

On Mi, Apr 02, 2008 at 11:18:42 -0400, Ross S. W. Walker wrote:
> Javier Guerra wrote:
> > On Wed, Apr 2, 2008 at 9:52 AM, Igor Chubin <igor@xxxxxxx> wrote:
> > >  If I understand you right,
> > >  you say that
> > >
> > >
> > >  hostA# dump / | ssh hostB restore
> > >
> > >  is more effective than:
> > >
> > >  hostA# rsync -a / hostB:/
> > 
> > i like to use rsync to replicate running servers.  of course, for
> > one-shot copy it's no faster than other dump-transfer-restore schemas;
> > but it's quite easy to use to quickly converge almost to a 'snapshot'
> > capability:
> > 
> > 1: do a full rsync, might take tooo long, lots of stuff wouldn't be
> > really consistent

To solve the problem (if you use LVMs)
you should make snapshots and than sync files 
from them.

> > 2: repeat rsync, should be far faster, copying only the differences.
> > 3: keep repeating until the whole copy is comfortably short. usually
> > the third iteration is less than a couple minutes
> > 4: quick: shut down services, one last rsync, start services.
> > 5: done!
> 
> Or, take a snapshot, mount it, then rsync off that.

Don't forget to make sync before snapshotting.
It will work without syncing to but it's better
to use it to be sure that there no information
cached by FS and not written to LVs.

# sync; lvcreate -n snap -L2G /dev/VG/source




> 
> -Ross
> 
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-- 
WBR, i.m.chubin


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