Hello Saverio,
Thanks for your answer. In that case the problem is that I thought the
patch you are referring to was already make in Kilo.
Doing snapshots directly from ceph goes fast:
[root@ceph01: ~] # time rbd -p volumes snap create
volume-fecc8258-e6d8-4d3c-9ac2-fe98b5dbbc2f@mytestsnap
real 0m1.062s
user 0m0.090s
sys 0m0.011s
[root@ceph01: ~] # rbd -p volumes info
volume-fecc8258-e6d8-4d3c-9ac2-fe98b5dbbc2f
rbd image 'volume-fecc8258-e6d8-4d3c-9ac2-fe98b5dbbc2f':
size 10240 MB in 2560 objects
order 22 (4096 kB objects)
block_name_prefix: rbd_data.d30dc62fe6784
format: 2
features: layering
flags:
[root@ceph01: ~] # rbd -p volumes snap ls
volume-fecc8258-e6d8-4d3c-9ac2-fe98b5dbbc2f
SNAPID NAME SIZE
4 mytestsnap 10240 MB
Regards,
Andreas
On 03/03/2016 08:37 AM, Saverio Proto wrote:
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.val...@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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