On Mon, 2019-04-08 at 05:45 +0000, Manuel Sopena Ballesteros wrote:
Dear Openstack community,
I have 1 physical node with x4 nvidia nv100 running 1 fat vm. Additionally I am adding a nvme drive into that host and I would like to attach the nvme drive to the vm. Ideally I prefer to avoid data migration and redeploy the software.
My problem is that I don't have another host with gpus so I am guessing that the vm can't be migrated. Am I right assuming this? we do have a config option to allow same host resize however in your case it likely still wont work.
when we do a resize to a new flavor we need to temporaily claim both the existing resouce for the currnt flavor and the new resouces for the target flavor. so unless you have 8 gpus on that system it will fail. you could try shelving the vm. resizing and unshelving. but really there is no good option here.
So far I thought about 2 possibilities but I don't know whether they would work:
Option 1: crate a new flavor with the pci device pass-through and resize existing vm (I hope the new vm with the new flavor will have the nvme attached).
if you have enough space for the new flavor then yes that should work.
Option 2: convert ephemeral virtual disk into a bootable volume. Destroy vm. Create new vm with the new volume as a boot device. if all the data you want to keep is in the root disk then a snapshot will work but this would evffectivly be the same as the shelve resize unselve workflow i suggested above. if you have addtional ephemeral disk beyond the root disk then you should backup all the data to a cinder volume manually first. then recreate the vm and attach those volumes.
Which option would be preferred? Is there any other think I can do?
Thank you very much
Manuel
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