[DRBD-user] DRBD, Xen, HVM and live migration

Arnold Krille arnold at arnoldarts.de
Fri Sep 23 19:03:35 CEST 2011


On Friday 23 September 2011 18:28:41 Felix Frank wrote:
> On 09/23/2011 06:18 PM, Bart Coninckx wrote:
> > Felix,
> > do you combine your setup with clustering software? Or do you script a
> > live migration? I'm intrigued by how you handle the timing in the latter
> > case.
> 
> ah, I didn't make this really clear.
> 
> I haven't set this up with either live migration capabilities nor
> pacemaker. All I have is a hot standby for manual recovery in case of a
> primary node failure. Sorry.
> 
> I believe that for pacemaker, you would have both your nodes be primary
> at all times (i.e., not use a master-slave set at all).
> Not a thrilling perspective, I guess.

Dual primary isn't really needed (but its very nice to have).
If you use one drbd-resource per vm, you need the dual-primary only during the 
migration.
You can also run single-master that is exported via iscsi/aoe and mounted to 
all nodes, cluster filesystem on top and you also get an extendible vm-
platform. But then you will have vms writing over network to the other node 
through iscsi which is writing back to your node via drbd...

Have fun,

Arnold
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