KB450106 – Ceph Recovery

Last modified: October 23, 2019
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Speed up backfilling speed. If you see lots of backfill_wait in the status of your pools check if the output “ceph –show-config | grep osd_max_backfill” is equal to 1.

If so, you can speed up recovery with:

ceph tell osd.* injectargs '--osd_max_backfills=10'

Be careful as this can severely impact the client IO. A small trickle recovery is by design over-opening the floodgates. The above command will open the floodgates.

You cannot immediately set this option back either. Once a Placement Group starts backfill it has to complete.

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