[gpfsug-discuss] Reexporting GPFS via NFS on VM host

[Christopher J. Walker]

On 13/08/15 15:32, Simon Thompson (Research Computing - IT Services) wrote:
>
>> I've set up a couple of VM hosts to export some of its GPFS filesystem
>> via NFS to machines on that VM host[1,2].
>
> Provided all your sockets no the VM host are licensed.

Yes, they are.

>
>> Is live migration of VMs likely to work?
>>
>> Live migration isn't a hard requirement, but if it will work, it could
>> make our life easier.
>
> Live migration using a GPFS file-system on the hypervisor node should work
> (subject to the usual caveats of live migration).
>
> Whether live migration and your VM instances would still be able to NFS
> mount (assuming loopback address?) if they moved to a different
> hypervisor, pass, you might get weird NFS locks. And if they are still
> mounting from the original VM host, then you are not doing what the FAQ
> says you can do.
>

Yes, that's the intent -  VMs get access to GPFS from the hypervisor - 
that complies with the licence and, presumably, should get better 
performance.

It sounds like our problem would be the NFS end of this if we try a live 
migrate.

Chris