On 08/01/2017 02:32 PM, Mike Lowe wrote:
Two things, first info does not show how much disk is used du does. Second, the semantics count, copy is different than clone and flatten. Clone and flatten which should happen if you have things working correctly is much faster than copy. If you are using copy then you may be limited by the number of management ops in flight, this is a setting for more recent versions of ceph. I don’t know if copy skips zero byte objects but clone and flatten certainly do. You need to be sure that you have the proper settings in nova.conf for discard/unmap as well as using hw_scsi_model=virtio-scsi and hw_disk_bus=scsi in the image properties. Once discard is working and you have the qemu guest agent running in your instances you can force them to do a fstrim to reclaim space as an additional benefit.
Just a heads-up...with virtio-scsi there is a bug where you cannot boot from volume and then attach another volume.
(The bug is 1702999, though it's possible the fix for 1686116 will address it in which case it'd be fixed in pike.)
Chris _______________________________________________ OpenStack-operators mailing list OpenStack-operators@lists.openstack.org http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-operators
