I think this thread has inadvertantly conflated the two.

Balancer:  ceph-mgr module that uses pg-upmap to balance OSD utilization / 
fullness

Autoscaler:  attempts to set pg_num / pgp_num for each pool adaptively 


> 
> The balancer does a pretty good job. It's the PG autoscaler that has bitten
> us frequently enough that we always ensure it is disabled for all pools.

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