Hello,
so I upgraded my cluster from 89 to 90 and now I get:
~# ceph health
HEALTH_WARN too many PGs per OSD (864 > max 300)
That is a new one. I had too few but never too many. Is this a problem
that needs attention, or ignorable? Or is there even a command now to
shrink PGs?
The message did not appear before, I currently have 32 OSDs over 8 hosts
and 9 pools, each with 1024 PG as was the recommended number according
to the OSD * 100 / replica formula, then round to next power of 2. The
cluster has been increased by 4 OSDs, 8th host only days before. That is
to say, it was at 28 OSD / 7 hosts / 9 pools but after extending it with
another host, ceph 89 did not complain.
Using the formula again I'd actually need to go to 2048PGs in pools but
ceph is telling me to reduce the PG count now?
Kind regards
René
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