Re: [Xen-users] Updating DomUs kernels

["Fajar A. Nugraha" <fajar@xxxxxxxxx>]

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.

-- 
Fajar


>
> Fajar A. Nugraha wrote:
>>
>> On Tue, Dec 1, 2009 at 3:30 PM, Martin Gombac( <martin@xxxxxx> wrote:
>>>
>>> Hi,
>>>
>>> i don't think CentOS 5.4 pvgrub/pygrub support drbd disk which is
>>> essential
>>> for my HA cluster with non interruptive failover. Will look into it.
>>
>> It does not support drbd:/ resource type (at least not last time I
>> check), but it works fine with phy:/dev/drbd/by-res/... (by-res
>> symlinks available starting drbd 8.3). That's what I currently use.
>>
>

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