On 2020-08-07 12:07, Ingo Reimann wrote:
> i`m am not sure, if we really have a problem, but it does not look healthy.
It might be related to the change that is mentioned in another thread:
"block.db/block.wal device performance dropped after upgrade to 14.2.10"
TL;DR: bluefs_buffered_io has been changed to "false" in 14.2.10. It
doesn't use buffer cache in that case, and in certain workloads (i.e.
snap trimming) this seem to have a big impact, even for environments
that have large osd_memory_target.
I would change that back to "true" ("ceph config set osd
bluefs_buffered_io true" should do the trick). Not sure if the OSDs need
a restart afterwards, as the config change seem to be effectve
immediately for running daemons.
Gr. Stefan
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