* Eugen Block <ceph-users@ceph.io> on Mon, 12 Oct 2026 at 06:51 -0000:
That's the main reason we don't use autoscaler in production clusters. We don't want unattended pg splits and merging, so we always disable it. Just recently there was a similar question in slack, and everone who responded said basically the same. I guess you could try the bulk flag to see if that prevents Ceph from decreasing pg_num:
ceph osd pool set <pool> bulk true
Thanks for the replies. That is the impression I am getting as well. The pool is already set to bulk, so I guess we'll leave this off for the time being -- hopefully a future version will handle this better. (still quite a few improvements we're waiting/hoping for, especially key rotation, as this was not handled too well in 19.2.6.) --Martin