Tested on groovy

lsb_release -a
--------------
Distributor ID:	Ubuntu
Description:	Ubuntu 20.10
Release:	20.10
Codename:	groovy

dpkg -l | grep ceph
ii  ceph                                 15.2.8-0ubuntu0.20.10.1             amd64        distributed storage and file system
ii  ceph-base                            15.2.8-0ubuntu0.20.10.1             amd64        common ceph daemon libraries and management tools
ii  ceph-common                          15.2.8-0ubuntu0.20.10.1             amd64        common utilities to mount and interact with a ceph storage cluster
ii  ceph-mds                             15.2.8-0ubuntu0.20.10.1             amd64        metadata server for the ceph distributed file system
ii  ceph-mgr                             15.2.8-0ubuntu0.20.10.1             amd64        manager for the ceph distributed file system
ii  ceph-mgr-modules-core                15.2.8-0ubuntu0.20.10.1             all          ceph manager modules which are always enabled
ii  ceph-mon                             15.2.8-0ubuntu0.20.10.1             amd64        monitor server for the ceph storage system
ii  ceph-osd                             15.2.8-0ubuntu0.20.10.1             amd64        OSD server for the ceph storage system
ii  libcephfs2                           15.2.8-0ubuntu0.20.10.1             amd64        Ceph distributed file system client library
ii  python3-ceph-argparse                15.2.8-0ubuntu0.20.10.1             amd64        Python 3 utility libraries for Ceph CLI
ii  python3-ceph-common                  15.2.8-0ubuntu0.20.10.1             all          Python 3 utility libraries for Ceph
ii  python3-cephfs                       15.2.8-0ubuntu0.20.10.1             amd64        Python 3 libraries for the Ceph libcephfs library

ceph versions

{
    "mon": {
        "ceph version 15.2.8 (bdf3eebcd22d7d0b3dd4d5501bee5bac354d5b55) octopus (stable)": 1
    },
    "mgr": {
        "ceph version 15.2.8 (bdf3eebcd22d7d0b3dd4d5501bee5bac354d5b55) octopus (stable)": 1
    },
    "osd": {
        "ceph version 15.2.8 (bdf3eebcd22d7d0b3dd4d5501bee5bac354d5b55) octopus (stable)": 3
    },
    "mds": {},
    "overall": {
        "ceph version 15.2.8 (bdf3eebcd22d7d0b3dd4d5501bee5bac354d5b55) octopus (stable)": 5
    }
}

Enabled balancer and do I/O
---------------------------
ceph mgr module enable balancer
ceph balancer on
ceph osd set-require-min-compat-client luminous
ceph balancer mode upmap
ceph balancer status

ceph osd pool create test 128 128
rados bench -p test 10 write --no-cleanup


ceph -s
--
  cluster:
    id:     dbb7d488-75c5-11eb-ae41-9f233e631612
    health: HEALTH_OK
 
  services:
    mon: 1 daemons, quorum juju-cfcb57-ussuri-0 (age 10m)
    mgr: juju-cfcb57-ussuri-0(active, since 10m)
    osd: 5 osds: 3 up (since 7m), 3 in (since 2h)
 
  data:
    pools:   2 pools, 114 pgs
    objects: 337 objects, 1.3 GiB
    usage:   7.0 GiB used, 23 GiB / 30 GiB avail
    pgs:     0.877% pgs not active
             113 active+clean
             1   peering
 
  progress:
    PG autoscaler decreasing pool 2 PGs from 128 to 32 (60s)
      [==..........................] (remaining: 8m)
 

for pg in 2.60 2.61 2.62 2.63 2.64 2.65 2.66 2.67 2.68 2.69 2.6a 2.6b 2.6c 2.6d 2.6e; do
  ceph pg deep-scrub $pg
done