Hi,
You should upgrade to the latest firefly release. Your probably suffering from the known issue with snapshot trimming.
Cheers, Dan
On Jul 4, 2015 10:19, "Eino Tuominen" <eino@xxxxxx> wrote:
>
> Hello,
>
> We are running 0.80.5 on our production cluster and we are seeing slow requests when deleting rbd snapshots. We have now reduced snapshot counts to 4 weeklies but it seems that the snapshot count is not a factor of this problem. The cluster is practically unresponsive so long that clients timeout.
>
> Here are top ten slowest requests per osd from last night (times in seconds):
>
> 1 /var/log/ceph/ceph-osd.46.log 1920
> 2 /var/log/ceph/ceph-osd.42.log 1455
> 3 /var/log/ceph/ceph-osd.74.log 1292
> 4 /var/log/ceph/ceph-osd.77.log 1170
> 5 /var/log/ceph/ceph-osd.48.log 1083
> 6 /var/log/ceph/ceph-osd.0.log 960
> 7 /var/log/ceph/ceph-osd.40.log 960
> 8 /var/log/ceph/ceph-osd.57.log 960
> 9 /var/log/ceph/ceph-osd.61.log 960
> 10 /var/log/ceph/ceph-osd.76.log 960
>
> Some OSDs don't report slow requests at all, they are not evenly distributed.
>
> Currently we run journals on the osd sata drives, but are considering upgrading to SSD journals. However, we do not have any performance problems other than when deleting snapshots.
>
> Is there any way to mitigate the problem other than investing on SSD journals?
>
> --
> Eino Tuominen
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