Thank you for your response quickly.
My cluster version is 18.2.1 and the OSD's scheduler is mClick.
I set osd_mclock_override_recovery_settings to true when I was changing
osd_max_backfills & osd_recovery_max_active.
Do I set osd_mclock_override_recovery_settings to true when I change
osd_recovery_max_single_start?
Could you explain more what osd_recovery_max_single_start is? I wonder whether
it affects the number of "backfills_in_flight" & "recovering" in pg query.
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