expected I/O / rand 4k iops

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Hello list,

is there any calculation of expected I/O available?

I've a test system running 6 hosts 4 OSDs each using SSD - i get 20.000
to 40.000 IOP/s not as much as i expected but OK right now.

If i replace the SSDs on one host with spinning disks but still using
dedicated journal on ssd (20GB / Disk/OSDK), i'm not able to get more
than 300 to 400 iop/s this seems to be pretty low.

Everything tested using 0.56.4 and Qemu RBD.

Greets,
Stefan
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