Am 2026-02-17 20:24, schrieb Robert Lukan via ceph-users:

Hi Robert,

   Are there known risks to "stepping down" PGs in increments of, say,
   10-20% at a time while the cluster is under load?
   2.

Reducing the number is best done via halveing not some aribtrary percentage in order to keep the number a power of 2.

Given the 16k PG count, is there a specific "recovery/backfill" throttle we should prioritize to ensure VM performance isn't impacted during the
   merge process?

The performance impact of reducing the number of PGs should be fine.

Regards
--
--martin konold
ppa. Martin Konold

--
Martin Konold - Prokurist, CTO
KONSEC GmbH -⁠ make things real
Amtsgericht Stuttgart, HRB 23690
Geschäftsführer: Andreas Mack
Im Köller 3, 70794 Filderstadt, Germany
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