Re: Wide EC pool causes very slow backfill?

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Hi,


> Given that the first host added had 19 OSDs, with none of them anywhere
> near the target capacity, and the one we just added has 22 empty OSDs,
> having just 22 PGs backfilling and 1 recovering seems somewhat
> underwhelming.
>
> Is this to be expected with such a pool? Mclock profile is
> high_recovery_ops.
>

Since you are already using the high_recovery_ops profile, you could
additionally try incrementing
"osd_max_backfills" (default: 1) by a small amount (2 or 3) using the
following procedure and see
if it improves the backfill rate:

https://docs.ceph.com/en/quincy/rados/configuration/mclock-config-ref/#steps-to-modify-mclock-max-backfills-recovery-limits

-Sridhar
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