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

[Bart Coninckx <bart.coninckx@xxxxxxxxxx>]

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.
> >
> > _______________________________________________
> > Xen-users mailing list
> > Xen-users@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-users
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