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>> The change I made that helped the most was to disable NBD.  You have
>
> Was that to disable injection at startup?

No, NBD is just slow and unreliable for some reason.  Disabling it made
my users happy.  I haven't had time to find out why NBD is so horrible.

Eventually I would like to see /var/lib/glance/images and
/var/lib/nova/instances/_base be on the same BTRFS file system and use
reflink copies.

Mark