Re: [Xen-users] combine DRBD and LVM for live migration and snapshot capabilities

[Bart Coninckx <bart.coninckx@xxxxxxxxxx>]

Hi Olivier,

thx for your answer. As I progress reading about this, you do have a 
point. I seem to have to tackle this by either cLVM or OCFS2.
The sad thing about cLVM in SLES11 is that it cannot do snapshots.

But maybe since I'm using nested LVM, the bottom LVM can do a snapshot 
anyway.
thx again,

B.


On 09/25/11 21:19, Olivier B. wrote:
> Excepting pacemaker, I have that kind of setup.
>
> It works, but per security I enable the dual primary setup only while
> doing a live migration.
> Otherwise, in case of an error with Pacemaker, you will destroy your data.
>
> Olivier
>
>
> On 25/09/2011 21:12, Bart Coninckx wrote:
> > Hi all,
> >
> >
> > I'd like to have your ideas on this Xen HA setup:
> >
> > - two DRBD machines, capable of dual primary
> > - per virtual machine a nested DRBD config, meaning: VG-LV-DRBD-VG-LV.
> > The bottom LVM config is to expand the DRBD device if needed. The top
> > one is for the virtual machine itself.
> > - setting at least the top layer VG to active on both node.
> > - have Pacemaker handle the virtual machines as cluster resources.
> >
> > Since the upper LVM config is active on both nodes, I would think a
> > live migration should work. Am I right?
> >
> > I would also think a snapshot can be taken from the top LV (after a xm
> > save and before a xm restore) for backup purposes. Would this harm
> > anything? If Pacemaker makes sure only one node can run a particular
> > virtual machine, I would think things are OK, but I could be sorely
> > mistaking.
> >
> > thx!!
> >
> > B.
> >
> > _______________________________________________
> > Xen-users mailing list
> > Xen-users@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-users
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-users

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