Hi,
Looking at our configuration during a recovery operation (misplaced
objects after adding PG in a pool) that I found a bit slow, I saw that
~30 OSD over 500 had an entry for osd_mclock_max_capacity_iops_hdd in
the configuration DB (and almost all the SSD). Despite all HDD and SSD
being the same models (and the server HW being the same). As this value
can have a significant impact on recovery time/speed with mclock, I was
wondering if this value is periodically refreshed, in case one
measurement was wrong (perturbated by external factors). The
documentation is not very clear about this and seems to say that the
bench used to estimate the IOPS capacity is run only when the OSD is
activated (which may make sense as it is before there is any other
activity on it)? I'm also wondering why we observe value like 350 on
some OSD as the HW is the same on all servers?
Currently, I tend to remove all the osd_mclock_max_capacity_iops_xxx
entries from the DB periodically but it's probably not the right approach...
Cheers,
Michel
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