Hello Michael, Thanks for the reply. It seems like ceph isn't actually "mounting" the rbd to the vm host which is where I think I was getting hung up (I had previously been attempting to mount rbds directly to multiple hosts and as you can imagine having issues).
Could you possible expound on why using a clustered filesystem approach is wrong (or conversely why using RBD's is the correct approach)? As for format2 rbd images, it looks like they provide exactly the Copy-On-Write functionality that I am looking for. Any caveats or things I should look out for when going from format 1 to format 2 images? (I think I read something about not being able to use both at the same time...) Thanks Again, Jon A On Mon, Oct 14, 2013 at 4:42 PM, Michael Lowe <j.michael.l...@gmail.com>wrote: > 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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