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Re: [Linux-cluster] Shared storage across clustered VMs?




Jeff Karpinski <jeff 3d0g net> a écrit :

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.

NFS is a much simpler solution. A few days ago, I was supporting NFS instead of a cluster FS for a classroom, in a LTSP setup. But one drawback could be that without any high-availability solution, the server becomes a SPOF. Or do you have a Netapp filer^W^W a server providing high availability ? Any thoughts on this ?


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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--
Xavier Montagutelli
Université de Limoges - Service Commun Informatique
123 Avenue ALBERT THOMAS
87060 LIMOGES CEDEX
Tél : +33 (0)5 55 45 77 20



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