Hi, On a OpenStack environment I encountered a VM which went into R/O mode after a RBD snapshot was created. Digging into this I found 10s (out of thousands) RBD images which DO have a running VM, but do NOT have a watcher on the RBD image. For example: $ rbd status volumes/volume-79773f2e-1f40-4eca-b9f0-953fa8d83086 'Watchers: none' The VM is however running since September 5th 2017 with Jewel 10.2.7 on the client. In the meantime the cluster was already upgraded to 10.2.10 Looking further I also found a Compute node with 10.2.10 installed which also has RBD images without watchers. Restarting or live migrating the VM to a different host resolves this issue. The internet is full of posts where RBD images still have Watchers when people don't expect them, but in this case I'm expecting a watcher which isn't there. The main problem right now is that creating a snapshot potentially puts a VM in Read-Only state because of the lack of notification. Has anybody seen this as well? Thanks, Wido _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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