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Re: [Xen-users] DRBD, Xen, HVM and live migration

To: Joseph Glanville <joseph.glanville@xxxxxxxxxxxxxx>
Subject: Re: [Xen-users] DRBD, Xen, HVM and live migration
From: Bart Coninckx <bart.coninckx@xxxxxxxxxx>
Date: Thu, 12 May 2011 20:40:14 +0200
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Hi Jospeh,

that's indeed what I figured. The Pacemaker cluster software should take care of avoiding split brains. I will need to convince certain people of investing into a STONITH device.


B.


On 05/11/11 06:09, Joseph Glanville wrote:
Hi,

Using the DRBD VBD backend over simply using PHY has one main advantage.

If you are using drbd: you don't need to have the system contstantly
in dual-primary mode, which can cause data corruption and increases
the chances of a split brain event occuring in a network segregation
senario.
If you are fine using allow-dual-primary and become-primary-on: both
then it no longer makes any difference.

Joseph.

On 11 May 2011 01:05, Bart Coninckx<bart.coninckx@xxxxxxxxxx>  wrote:
Hi,

I want to combine all the above mentioned technologies.

The Linbit pages warn not to use the drbd: VBD with HVM DomUs.

This page however:

http://publications.jbfavre.org/virtualisation/cluster-xen-corosync-pacemaker-drbd-ocfs2.en

(thank you Jean), simply puts two DRBD devices in dual primary mode and
starts Xen DomUs while pointing to the DRBD devices with phy: in the DomU
config files.
Live migration and HVM seem possible.

Is it as simple as Jean describes it? What is the advantage then of the
drbd: VBD? Just seeing to it that the dual primary is available?


Thx!


B.

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