[DRBD-user] Temporary dual primary-mode during xen live migration ?

Iustin Pop iustin at google.com
Fri Dec 19 09:53:15 CET 2008

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.


Just throwing some info out: this is exactly how Ganeti (manager for Xen and
DRBD) handles live migration (disconnect, reconnect in dual-mode, etc.).
Normally all DRBD devices are in single-master mode.

regards,
iustin

On Thu, Dec 18, 2008 at 11:07:23PM +0100, Christoph Adomeit wrote:
> I think the added security is obvious:
> 
> reduce the risk of accidentally mounting a filesystem on 2 
> machines and destroying it to an absolue minimum and avoid the
> overhead and complexity of a cluster filesystem and file-backed
> vbds if you only need them for rare cases of live migrating
> xen domUs.
> 
> 
> > So I don't really see the added security in scripting
> > 
> > - enable dual-primary mode
> > - make primary
> > - migrate
> > - make secondary
> > - disable dual-primary mode
> > 
> > versus the existing
> > 
> > - make primary
> > - migrate
> > - make secondary.
> > 
> -- 
> Christoph Adomeit
> GATWORKS GmbH
> Reststrauch 191
> 41199 Moenchengladbach
> Sitz: Moenchengladbach
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> Geschaeftsfuehrer:
> Christoph Adomeit, Hans Wilhelm Terstappen
> 
> Christoph.Adomeit at gatworks.de     Internetloesungen vom Feinsten
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