Re: Slow requests when deleting rbd snapshots

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Can you tell us when it was fixed so that we see this fix on github?

 Kinjo

On Sat, Jul 4, 2015 at 8:08 PM, Dan van der Ster <dan@xxxxxxxxxxxxxx> wrote:

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
> _______________________________________________
> ceph-users mailing list
> ceph-users@xxxxxxxxxxxxxx
> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com


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