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! _______________________________________________ ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-leave@ceph.io