On 08/26/2013 01:49 PM, Josh Durgin wrote:
On 08/26/2013 12:03 AM, Wolfgang Hennerbichler wrote:
hi list,
I realize there's a command called "rbd lock" to lock an image. Can
libvirt use this to prevent virtual machines from being started
simultaneously on different virtualisation containers?
wogri
Yes - that's the reason for lock command's existence. You have
to be careful with things like live migration though, which will have
the device open in two places while migration completes. If libvirt
could use rbd locks like it uses its sanlock plugin, it would be
able to deal with this correctly.
To be clear, libvirt doesn't use rbd locking at all right now, but it
could probably be patched to do so without too much effort.
Josh
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