Am 03.02.26 um 2:31 PM schrieb Rok Jaklič:
On Tue, Feb 3, 2026 at 2:26 PM Robert Sander via ceph-users <ceph- users@ceph.io <mailto:ceph-users@ceph.io>> wrote:
Am 03.02.26 um 2:18 PM schrieb Rok Jaklič via ceph-users:
> 2 OSD(s) experiencing slow operations in BlueStore > 2 OSD(s) experiencing stalled read in db device of BlueFS
Are your OSDs HDD only?
Yes.
Does not affect users much. Usually those messages appear when we are reweighting and changing failed disks.
These HDDs will be maxed out with the recovery work and cannot serve anything else any more. I have seen HDD only clusters going into the "spiral of death" because the HDDs cannot answer fast enough. OSDs randomly dropping out making the whole system unstable. The RocksDB is such a random IO application that it is not suitable for HDDs. It should always be put on flash storage (SSD/NVMe). Regards -- Robert Sander Linux Consultant Heinlein Consulting GmbH Schwedter Str. 8/9b, 10119 Berlin https://www.heinlein-support.de Tel: +49 30 405051 - 0 Fax: +49 30 405051 - 19 Amtsgericht Berlin-Charlottenburg - HRB 220009 B Geschäftsführer: Peer Heinlein - Sitz: Berlin