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move to ceph backend

asked 2015-01-05 07:56:51 -0500

Ramonskie gravatar image

we already use ceph for our volumes in openstack but we also want to use ceph as the vm storage so we can do live migrations

i want to know if this is possibile with already deployed vms on the openstack nodes and what whould happen when i configure openstack with ceph for the vm storage

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answered 2015-01-05 14:19:54 -0500

mpetason gravatar image

One way to do this is to migrate via Snapshots. Keep in mind you'll want most of your images to be RAW and disks to be RAW instead of qcow2 when using Ceph.

http://docs.openstack.org/user-guide/...

You'll need to create snapshots, download snapshots, disable services so users don't keep trying to add new instances, change the back-end, restart services, verify services + instances, upload snapshot, launch from snapshot.

If you are changing the back-end for Nova to Ceph then you may want to look into backing Glance + Cinder as well, that way you are managing one Ceph cluster and can use it across all services.

Also, with Ceph you should look into Jumbo frames.

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Asked: 2015-01-05 07:56:51 -0500

Seen: 221 times

Last updated: Jan 05 '15