Ceph is complaining: too many PGs

Quick tip.

Sometimes by running ceph -s, you can get a WARNING state saying:

health HEALTH_WARN
too many PGs per OSD (438 > max 300)

To suppress this warning, append the following configuration options into your ceph.conf:

mon_pg_warn_max_per_osd = 0

Eventually restart all your Ceph monitors.