[Linux-cluster] Shared storage across clustered VMs?

[Brett Cave]

On Thu, Mar 4, 2010 at 4:23 AM, Jeff Karpinski <jeff at 3d0g.net> wrote:

> Our assigned Red Hat engineer was on-site today and pointed out the
> blindingly obvious solution. Can't believe I didn't think of it: Run NFS as
> a clustered service and have the VMs mount that. That way ANY system - even
> outside of the cluster - can also access the data.
>

This is what we are doing, works great. We considered presenting the raw
devices from our SAN (fc connectivity instead of iSCSI) to the VM's, but
opted against it due to dynamics of changing # of VM's and GFS requirements
for journals / # of nodes, as well as multicast issues (each dom0 uses a
different routed network for VM's). Each VM mounts NFS from its host.



>
> Man, I feel dumb. I should forfeit my RHCE. :-P
>
> On Mar 3, 2010, at 12:28 AM, Xavier Montagutelli wrote:
>
> > On Tuesday 02 March 2010 23:50:26 Jeff Karpinski wrote:
> >> I've got a 4 node cluster back-ended with iSCSI storage that's happily
> >> running 20 or so VMs. I now have a request to present some shared
> >> storage across several of the VMs and am wondering what's the best way
> >> to accomplish this. GFS2? Can VMs even communicate back with the cluster
> >> for lock_dlm to work?
> >>
> >> Interested in how others have skinned this cat...
> >
> > I don't know if GFS2 is the best way to share data among your VMs.
> >
> > But if you go for GFS2, I suppose the clusters should be different : one
> > cluster for the hosts, and one cluster for the VMs having a shared disk
> with
> > GFS2. They have different purposes, you should not mix them.
> >
> >
> >
> > --
> > Xavier Montagutelli                      Tel : +33 (0)5 55 45 77 20
> > Service Commun Informatique              Fax : +33 (0)5 55 45 75 95
> > Universite de Limoges
> > 123, avenue Albert Thomas
> > 87060 Limoges cedex
> >
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>
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