[ClusterLabs] Antw: SDB + Pacemaker for virtuals

[Ulrich Windl]

>>> Mohammed Alam <moalam9 at gmail.com> schrieb am 09.05.2016 um 08:17 in Nachricht
<CACDV14Mm9+hCC+dDrbj4pHAvRxhhzUceUniyPE=vakQ2xUC8UA at mail.gmail.com>:
> Hi,
> 
> I was reading Andrew Beekhof's blog (particularly this article:
> http://blog.clusterlabs.org/blog/2015/sbd-fun-and-profit/) and became very
> interested in setting up a cluster using SBD fencing on a shared FCOE
> storage device. I have a few quick questions.
> 
> Would Pacemaker + SBD fencing work on both KVM hypervisor and virtuals at
> the same time? I know something like this exists for XEN but wasn't sure if
> KVM would be able to do something similar.
> 
> If I wanted it just for virtual machine clusters, do the virtuals need to
> be presented with an additional shared storage? (Similar to how it works at
> hypervisor level) I was a bit confused about this.

See SBD as a communication media on shared storage. So you need shared storage to communicate.

> 
> Essentially I want to get to a state where I have 3 physical nodes, running
> 3-5 virtual machines each that are clustered across the 3 physical nodes,
> so one virtual from each clustered set can be running on any physical node
> accessing the same FCOE storage.  The physical nodes don't necessary need
> to be clustered.

So you use SBD in the VMs, not on the hosts.

> 
> Is this possible? Any helpful suggestions would be appreciated or if anyone
> has a guide on achieving a setup like this.

Haven't tried, but unless SBD uses the hsot watchdog to reset the host, it should work.

Ulrich

> 
> Thank you so much.
> 
> Best Regards,
> M.Alam