I am surprised by the error you are seeing with exclusive lock enabled. The rbd CLI should be able to send the 'snap create' request to QEMU without an error. Are you able to provide "debug rbd = 20" logs from shortly before and after your snapshot attempt?
-- Jason Dillaman ----- Original Message ----- > From: "Мистер Сёма" <anga...@gmail.com> > To: "ceph-users" <ceph-users@lists.ceph.com> > Sent: Monday, January 4, 2016 12:37:07 PM > Subject: [ceph-users] How to do quiesced rbd snapshot in libvirt? > > Hello, > > Can anyone please tell me what is the right way to do quiesced RBD > snapshots in libvirt (OpenStack)? > My Ceph version is 0.94.3. > > I found two possible ways, none of them is working for me. Wonder if > I'm doing something wrong: > 1) Do VM fsFreeze through QEMU guest agent, perform RBD snapshot, do > fsThaw. Looks good but the bad thing here is that libvirt uses > exclusive lock on image, which results in errors like that when taking > snapshot: " 7f359d304880 -1 librbd::ImageWatcher: no lock owners > detected". It seems like rbd client is trying to take snapshot on > behalf of exclusive lock owner but is unable to find this owner. > Without an exclusive lock everything is working nice. > > 2) Performing QEMU external snapshots with local QCOW2 file being > overlayed on top of RBD image. This seems really interesting but the > bad thing is that there is no way currently to remove this kind of > snapshot because active blockcommit is not currently working for RBD > images (https://bugzilla.redhat.com/show_bug.cgi?id=1189998). > > So again my question is: how do you guys take quiesced RBD snapshots in > libvirt? > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > _______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
