Config opt for osd-recovery-max-active

[Peter Sabaini]

Jewel defaults to osd-recovery-max-active=15; on a loaded cluster recovery operations can impact client responsiveness with this setting. I'm tuning it down so as to prevent that, and would propose a charm config opt to make this permanent.

[Xav Paice (xavpaice)]

https://review.openstack.org/#/c/461973/

[Paul Gear (paulgear)]

It appears that the ceph.conf template change in the above review goes into the wrong section (uses [global], should use [osd]).

It would be nice if, along with osd-max-backfills and osd-recovery-max-active, we could investigate adding support for osd-recovery-op-priority and osd-client-op-priority also.

[Paul Gear (paulgear)]

One other option which could probably be added in the same fashion is osd-max-recovery-threads.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/461973
Committed: https://git.openstack.org/cgit/openstack/charm-ceph-osd/commit/?id=f0de8613681a9114b14c11cc93b5ba3d790f0094
Submitter: Zuul
Branch: master

commit f0de8613681a9114b14c11cc93b5ba3d790f0094
Author: Xav Paice <email address hidden>
Date: Wed May 3 14:54:38 2017 +1200

    Add options for osd backfill pressure

    Added options for osd_max_backfills and osd_recovery_max_active, if we
    should want to override the default.

    Change-Id: Iaeb93d3068b1fab242acf2d741c36be5f4b29b57
    Closes-bug: #1661560