[ceph-users] Re: Degradation of write-performance after upgrading to Octopus

Thanks for your fast reply! We just tried all four possible combinations of bluefs_preextend_wal_files and bluefs_buffered_io, but the write-iops in test "usecase1" remain the same. By the way bluefs_preextend_wal_files has been false in 14.2.9 (as in 15.2.3). Any other ideas? David Orman wrote:

* bluestore: common/options.cc: disable bluefs_preextend_wal_files <-- from 15.2.3 changelogs. There was a bug which lead to issues on OSD restart, and I believe this was the attempt at mitigation until a proper bugfix could be put into place. I suspect this might be the cause of the symptoms you're seeing.

https://tracker.ceph.com/issues/45613 https://github.com/ceph/ceph/pull/35293