Hi Folks, We are currently running with one nearfull OSD and 15 nearfull pools. The most full OSD is about 86% full but the average is 58% full. However, the balancer is skipping a pool on which the autoscaler is trying to complete a pg_num reduction from 131,072 to 32,768 (default.rgw.buckets.data pool). However, the autoscaler has been working on this for the last 20 days, it works through a list of objects that are misplaced but when it gets close to the end, more objects get added to the list. This morning I observed the list get down to c. 7,000 objects misplaced with 2 PGs active+remapped+backfilling, one PG completed the backfilling then the list shot up to c. 70,000 objects misplaced with 3 PGs active+remapped+backfilling. Has anyone come across this behaviour before? If so, what was your remediation? Thanks in advance for sharing. Bruno Cluster details: 3,068 OSDs when all running, c. 60 per storage node OS: Ubuntu 20.04 Ceph: Pacific 16.2.13 from Ubuntu Cloud Archive Use case: S3 storage and OpenStack backend, all pools three-way replicated