Ceph » mgr

After upgrading to 15.1 i got the "too few pgs" warning and enabled the autoscaler on a cache tier with:

ceph osd pool set cache pg_autoscale_mode on

The warning went away but the pgs did not increase

ceph osd pool autoscale-status still shows the same:

POOL SIZE TARGET SIZE RATE RAW CAPACITY RATIO TARGET RATIO EFFECTIVE RATIO BIAS PG_NUM NEW PG_NUM AUTOSCALE

cache 4922 350.0G 1.0 465.5G 0.7518 1.0 8 128 on

While the PGs did not increase, the warning went away, mgr log says the following:

[pg_autoscaler ERROR root] pg_num adjustment on cache to 128 failed: (-1, '', 'splits in cache pools must be followed by scrubs and leave sufficient free space to avoid overfilling. use --yes-i-really-mean-it to force.')