On Thu, Sep 11, 2014 at 02:45:41PM +1000, Blair Bethwaite wrote:
Hi Michael!
On 11 September 2014 14:13, Michael Chapman <mike@very.puzzling.org> wrote:
Why is RBD is handled specially in this function? The current logic is that an RBD-backed disk is safe to be migrated even if it's got caching enabled, but I'm not sure how RBD is different from other backends in this regard.
I recall this has was discussed before but am having trouble finding the thread. I think the gist of it was that the rbd integration was just lucky, but it wasn't using the appropriate interfaces defined by libvirt for flushing.
And I think Debian patches away the qemuMigrationIsSafe pass for RBD, so it'll only pass for cache=none.
Debian doesn't ship such a patch. Cheers, -- Guido