On 08/14/2014 08:18 AM, Nigel Williams wrote: > Anyone know if this is safe in the short term? we're rebuilding our > nova-compute nodes and can make sure the Dumpling versions are pinned > as part of the process in the future. The client should be fully backwards compatible. It figures out which features are supported by the cluster's version. I recently worked with a cluster running on 0.67.9 with some 0.67.9 and 0.80.1 clients and that worked fine. I also live migrated KVM VMs running on Qemu+0.67.9 to Qemu+0.80.5 on a different host without any issues. I migrated between both versions a couple of times and the VMs kept running just fine. It was CloudStack in this case, but that doesn't matter since it's both Qemu+librbd > _______________________________________________ > ceph-users mailing list > ceph-users at lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > -- Wido den Hollander 42on B.V. Phone: +31 (0)20 700 9902 Skype: contact42on