[Linux-cluster] Shared storage across clustered VMs?

[Xavier Montagutelli]

Jeff Karpinski <jeff at 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.
>>
>>
>>
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>> 123, avenue Albert Thomas
>> 87060 Limoges cedex
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>
>
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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