PG bottlenecks

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On one of our cluster (3400 OSD, ~25PB, 12.2.4), we incremented pg_num &
pgp_num on one pool (EC 4+2) from 32k to 64k. After that cluster started
to be instable for one hour, pgs were inactive (some activating, some

Any idea what bottlenecks we hit? Any ideas what should I change in
configuration of ceph/os ?

Best Regards,

Rafał Wądołowski

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