Hello Achim,
good to hear someone else running this setup. We have changed the number
of backfills using
ceph tell osd.\* injectargs '--osd-max-backfills 1'
and it seems to work mostly in regards of issues when rebalancing.
One unsolved problem we have is machines kernel panic'ing, when i/o is
slow. We usually see a kernel panic in the sym53c8xx driver, especially for
those VMs with high i/o rates. We tried to upgrade the kernel in the VM
(Debian stable 3.2.0 -> Debian backports 3.16.0), but just have
different kernel panic in the same driver now.
Have you had the some problem and if so, how did you get it fixed?
Cheers,
Nico
Achim Ledermüller [Wed, Jan 07, 2015 at 05:42:38PM +0100]:
> Hi,
>
> We have the same setup including OpenNebula 4.10.1. We had some
> backfilling due to node failures and node expansion. If we throttle
> osd_max_backfills there is not a problem at all. If the value for
> backfilling jobs is too high, we can see delayed reactions within the
> shell, eg. `ls -lh` needs 2 seconds.
>
> Kind regards,
> Achim
>
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> Achim Ledermüller, M. Sc.
> Systems Engineer
>
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