I recall encountering something like this once when an instance termination 
failed halfway through - the root disk was removed but the instance record 
remained in the database. In my case, it didn't spontaneously happen, but was a 
requested termination that blew up at some point between removing the root disk 
and removing the instance record from the DB. If the instance action log 
doesn't indicate that anyone asked for the instance to be terminated, that's a 
bit weird.

From: [email protected] 
Subject: Re:[Openstack-operators] ceph rbd root disk unexpected deletion

Over the weekend a user reported that his instance was in a stopped state and 
could not be started, on further examination it appears that the vm had crashed 
and the strange thing is that the root disk is now gone.  Has anybody come 
across anything like this before?

And why on earth is it attempting deletion of the rbd device without deletion 
of the instance?

2017-03-12 10:59:07.591 3010 WARNING nova.virt.libvirt.storage.rbd_utils [-] 
rbd remove 4367a2e4-d704-490d-b3a6-129b9465cd0d_disk in pool ephemeral-vms 
failed
2017-03-12 10:59:17.613 3010 WARNING nova.virt.libvirt.storage.rbd_utils [-] 
rbd remove 4367a2e4-d704-490d-b3a6-129b9465cd0d_disk in pool ephemeral-vms 
failed
2017-03-12 10:59:26.143 3010 WARNING nova.virt.libvirt.storage.rbd_utils [-] 
rbd remove 4367a2e4-d704-490d-b3a6-129b9465cd0d_disk in pool ephemeral-vms 
failed

----------------------------

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