Hi,
We have a full SSD production cluster running on Pacific 16.2.10 and
deployed with cephadm that is experiencing OSD flapping issues.
Essentially, random OSDs will get kicked out of the cluster and then
automatically brought back in a few times a day. As an example, let's
take the case of OSD.184 :
-It flapped 9 times between January 15th and 17th with the following log
message each time : 2023-01-15T16:33:19.903+0000 prepare_failure
osd.184 from osd.49 is reporting failure:1
-On January 17th, it complains that there are slow ops and spam its logs
with the following line : heartbeat_map is_healthy 'OSD::osd_op_tp
thread 0x7f346aa64700' had timed out after 15.000000954s
The storage node itself has over 30 GB of ram still available in cache
and the drives themselves only seldom peak at 100% usage and that never
lasts more than a few seconds. CPU usage is also constantly around 5%.
Considering there is no other error messages in any of the regular logs,
including the systemd logs, why would this OSD not reply to heartbeats?
--
Jean-Philippe Méthot
Senior Openstack system administrator
Administrateur système Openstack sénior
PlanetHoster inc.
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