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-
[email protected] <mailto:[email protected]>> 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
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