I live migrate all the time using the rbd driver in qemu, no problems. Qemu will issue a flush as part of the migration so everything is consistent. It's the right way to use ceph to back vm's. I would strongly recommend against a network file system approach. You may want to look into format 2 rbd images, the cloning and writable snapshots may be what you are looking for.
Sent from my iPad > On Oct 14, 2013, at 5:37 AM, Jon <three1...@gmail.com> wrote: > > Hello, > > I would like to live migrate a VM between two "hypervisors". Is it possible > to do this with a rbd disk or should the vm disks be created as qcow images > on a CephFS/NFS share (is it possible to do clvm over rbds? OR GlusterFS over > rbds?)and point kvm at the network directory. As I understand it, rbds > aren't "cluster aware" so you can't mount an rbd on multiple hosts at once, > but maybe libvirt has a way to handle the transfer...? I like the idea of > "master" or "golden" images where guests write any changes to a new image, I > don't think rbds are able to handle copy-on-write in the same way kvm does so > maybe a clustered filesystem approach is the ideal way to go. > > Thanks for your input. I think I'm just missing some piece. .. I just don't > grok... > > Bestv Regards, > Jon A > > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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