[gpfsug-discuss] Reexporting GPFS via NFS on VM host
Christopher J. Walker
C.J.Walker at qmul.ac.uk
Wed Aug 26 14:46:56 BST 2015
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
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