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

Jose Nuno Neto jose.neto at liber4e.com
Fri Sep 23 13:52:51 CEST 2011


Just a small question,
Don't you have issues with the guest partitions being scanned on the hipervisor? On my servers it prevents drbd to start device

Cheers
Jose

Felix Frank <ff at mpexnet.de> wrote:

>Hi,
>
>On 09/23/2011 11:09 AM, Bart Coninckx wrote:
>> Hi all,
>> 
>> What would be a good strategy these days to accomplish this on a two
>> node system (no external storage)?
>
>A simple LVM -> DRBD -> Guest Partitions approach has worked fine for me.
>
>> Do I need to complexity of a clustered filesystem?
>
>Where would that come into play? Are you thinking of using disk image
>files for your guests? That sounds icky.
>
>> Could I throw LVM snapshots for backup somewhere in the mix too?
>
>Absolutely. But then, you can just sever the replication link and end up
>with a "free" unchanging image on the Secondary.
>Don't let your primary crash at that time, though - snapshots should add
>more safety.
>
>> I looked at http://www.drbd.org/users-guide/s-xen-configure-domu.html ,
>> but this seems to exclude HVM guests.
>
>I think it's a good option to have Xen use the DRBDs as plain block
>devices, i.e., Xen doesn't need to be aware of DRBD.
>I believe I read on this list that live migration is quite possible so
>long as both nodes become primary on time.
>
>HTH,
>Felix
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