Hi,
We have a production cluster homogeneous in terms of HDD devices and I'm
a little bit surprised that the osd_mclock_capacity_iops_hdd computed
for each OSD is so different (basically a x2 between the lowest and
highest values). I understand that sometimes the OSD bench is
perturbated by external factors leading to an inappropriate value and if
it is too low, it may impact in particular deep scrub duration.
The documentation [1] explains that the OSD bench is run at OSD
initialization, which is, I guess, startup time. It also suggests that
it can be run manually but I guess it makes no sense if the OSD is up
because of the concurrent activity. Am I right? How is the bench command
supposed to be run as I guess it doesn't work if the OSD is not up?
Also, the documentation explains that you can define a value that you
measured and seems to suggest that once defined, it will not be updated.
Am I right? If yes, does it mean that once the automatic bench has
determined a value the only way to update it is to delete it from the
config and restart the OSD (if you want the automatic bench to
update/redefine it)?
Best regards,
Michel
[1] https://docs.ceph.com/en/squid/rados/configuration/mclock-config-ref/
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