Thanks for the response, Trevor.
The root disk (/var/lib/nova/instances) must be on shared storage to run the live migrate.
I would argue that it is on shared storage. It is an RBD stored in Ceph, and that's available at each host via librbd.
I know this is supposed to work [1]. I'm just wondering if it requires disabled the "true" live migration in libvirt. I think Josh will know.
[1] https://lists.launchpad.net/openstack/msg15074.html
You should be able to run block migration (which is a different form of the live-migration) that does not require shared storage.I think block-migration would not be correct in this instance. There is no file to copy (there is no disk file in /var/lib/nova/instances/<domain>). Where is it going to copy it from/to? It's already an RBD.
I know this is supposed to work [1]. I'm just wondering if it requires disabled the "true" live migration in libvirt. I think Josh will know.
[1] https://lists.launchpad.net/openstack/msg15074.html
On Tue, Mar 12, 2013 at 4:13 PM, tra26 <tra26@xxxxxxxxxxxxx> wrote:
Travis,
The root disk (/var/lib/nova/instances) must be on shared storage to run the live migrate. You should be able to run block migration (which is a different form of the live-migration) that does not require shared storage.
Take a look at: http://www.sebastien-han.fr/blog/2012/07/12/openstack-block-migration/ for information regarding the block level migration.
-Trevor
On 2013-03-12 15:57, Travis Rhoden wrote:
Hey folks,verbatim. Ive been using this setup for a while now, and its all
Im wondering if the following is possible. I have OpenStack (Folsom)
configured to boot VMs from volume using Ceph as a backend for Cinder
and Glance. My setup pretty much follows the Ceph guides for thismigration? If I do OpenStacks normal "live" migration, it will pause
been really smooth.
However, I if I try do a live-migration, I get this:
RemoteError: Remote error: RemoteError Remote error:
InvalidSharedStorage_Remote vmhost3 is not on shared storage: Live
migration can not be used without shared storage.
One thing I am doing that may not be normal is that I am trying to do
the "true" live migration in KVM/libvirt, having set this in my
nova.conf:
live_migration_flag=VIR_MIGRATE_UNDEFINE_SOURCE,VIR_MIGRATE_PEER2PEER,VIR_MIGRATE_LIVE
Anyone know if this setup should work? Or if there is something I
should tweak to make it work? I was thinking that having the RBD
available via librbd at both the source and destination host makes
that storage shared storage. Perhaps not if I am trying to do live
the VM and move it, which is less than ideal, but workable.
Thanks,
- Travis
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