- osd max backfills: This is the maximum number of backfill operations allowed to/from OSD. The higher the number, the quicker the recovery, which might impact overall cluster performance until recovery finishes.
- osd recovery max active: This is the maximum number of active recover requests. Higher the number, quicker the recovery, which might impact the overall cluster performance until recovery finishes.
- osd recovery op priority: This is the priority set for recovery operation. Lower the number, higher the recovery priority. Higher recovery priority might cause performance degradation until recovery completes.
ceph tell 'osd.*' injectargs --osd-max-backfills=2 --osd-recovery-max-active=2
Recommendation
Start in small steps, observe the Ceph status, client IOPs and throughput and then continue to increase in small steps.
In the producton with regard to the applications and hardware infrastructure, we recommend setting these settings back to default as soon as possible.