Re: [Xen-users] Updating DomUs kernels

[Martin Gombac( <martin@xxxxxx>]

Tnx for the info.
It seems that i don't yet know enough about this, so i'll get back to 
you later on. :-) I'll try dual primary mode with phy and HVMs. :-)
Regards,
M.

Fajar A. Nugraha wrote:
> On Tue, Dec 1, 2009 at 7:29 PM, Martin Gombac( <martin@xxxxxx> wrote:
> > Sadly phy:/ is not an option, 'cause using it doesn't allow live
> > failover/migration of PVs from DRBD.
> Saids who?
>
> > If it did i could have live
> > failover/migration for HVM's too. That would be so cool. :-)
> AFAIK the only noticable difference between drbd:/ and phy: is the
> state of drbd device. On normal circumstances, with drbd:/ one would
> be primary, the other secondary. This is good because it prevents domU
> from starting at both dom0 at the same time (which might lead to
> corruption). However for live migration to work you still need to
> setup drbd for dual primary mode.
>
> With phy:/, both nodes will see the drbd block as primary. You may
> also need to setup drbd so that it becomes primary on both nodes on
> startup. Live migration works great. However you need to take extra
> precaution measures to make sure that at any one time only one dom0 is
> running a particular domU.
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