Murilo，
The latency of HDD is about 10ms+. and the IO stack in Ceph may spends
~3ms+,
so the test result is still in doubt. I guess the rbd test used the ram
cache.
You can paste more fio outputs here.
On 2023/3/17 07:16, Murilo Morais wrote:
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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