VM not responding on commands until snapshot running

[Dmytro Shevchenko]

Hi,

I noticed that while volume snapshot running, VM not executing other 
commands as Reboot or Stop. They are waiting in queue until previous 
command completed. Can anyone explain this behaviour, is this normal and 
why?

I'm using Ceph as primary storage and creating snapshot takes several 
seconds, but as next step CS copy this snap to secondary storage via 
'qemu-img convert ...' and this operation is quite slow.

Tested on 4.5.1 and 4.8.0.1 versions. Ceph as primary storage and NFS as 
secondary.


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Best regards
Dmytro