5MB/s in what mode?
For linear writes, that definitely means some kind of misconfiguration.
For random writes... there's a handbrake in Bluestore which makes random
writes run at half speed in HDD-only setups :)
https://github.com/ceph/ceph/pull/26909
And if you push that handbrake down you actually get better random writes
on HDDs with bluestore, too.
--
With best regards,
Vitaliy Filippov
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