RBD latency

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Good evening everyone!

Guys, what to expect latency for RBD images in a cluster with only HDD (36
HDDs)?

Sometimes I see that the write latency is around 2-5 ms in some images even
with very low IOPS and bandwidth while the read latency is around 0.2-0.7
ms.
For a cluster with only HDD is this latency expected? Is there any
parameter I can study to improve? What do you recommend for tuning in the
OS?

The latency between machines is always around 0.1ms, all connected via
fiber optics.

Thanks in advance!
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