physical vs osd performance

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Hello all,

Looking at grafana reports, can anyone point me to documentation that
outlines physical vs osd?  https://docs.ceph.com/en/latest/monitoring/
gives some basic info, but I'm trying to get a better understanding. For
instance, physical latency is 20ms and osd is 200ms, these are just made up
for this example, why the huge difference? Same thing if for bytes or iops,
just using latency as an example.

Thanks,
Curt
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