KB450422 – Ceph Backfill & Recovery

Last modified: April 29, 2021
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Ceph Backfill & Recovery

Scope/Description:

This article describes what ceph defines as recovery and backfill and how to adjust the thresholds to limit or increase recovery throughput

Prerequisites:

Steps:

  • Ceph defines “recovery” as moving pg’s when osd’s crashes and cfomes back online.
    • A more detailed explanation can be found here
  • Ceph defines “backfill” as moving pg’s when adding/removing osds
    • A more detailed explanation can be found here
  • There are the four config options for controlling recovery/backfill
Low Default High Custom
osd_max_backfills 1 1 4
osd_recovery_max_active 1 3 4
osd_recovery_max_single_start 1 1 4
osd_recovery_sleep 0.5 0 0

Verification:

Troubleshooting:

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