Open Stack

Hello Andreas,

what kind of snapshot are you doing ?

1) Snapshot of a instance running on a ephimeral volume ?
2) Snapshot of a instance booted from Volume ?
3) Snapshot of a volume ?

in case 1 the ephemeral volume is in the volume pool with the name
<instanceUUID>_disk
when you snapshot, this must be read to disk and then a image is
generated and uploaded to the glance pool.
This is slow, but the patch to make this faster and all within ceph
has been already merged in Mitaka
Look here:
https://etherpad.openstack.org/p/MAN-ops-Ceph
Under
Instance (ephemeral disk) snap CoW directly to Glance pool


You might also want to measure how fast your ceph can take snapshot,
without Openstack.

assuming that your ceph pool for volumes is called volumespool

try to make a snapshot by hand bypassing openstack using rbd CLI

rbd -p volumespool snap create volume-<UUID>@mytestsnapshotname

Does it take a long time as well ?

Saverio


2016-03-03 8:01 GMT+01:00 Andreas Vallin <andreas.vallin at it.uu.se>:
> We are currently installing a new openstack cluster (Liberty) with
> openstack-ansible and an already existing ceph cluster. We have both images
> and volumes located in ceph with rbd. My current problem is that snapshots
> take a very long time and I can see that snapshots are temporary created
> under /var/lib/nova/instances/snapshots/tmp on the compute node, I thought
> that this would not be needed when using ceph? The instance that I am
> creating a snapshot of uses a raw image that is protected. What can cause
> this behavior?
>
> Thanks,
> Andreas
>
>
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