There are 2:
fio -ioengine=rbd -direct=1 -name=test -bs=4k -iodepth=1 -rw=randwrite
-pool=bench -rbdname=testimg
fio -ioengine=rbd -direct=1 -name=test -bs=4k -iodepth=128 -rw=randwrite
-pool=bench -rbdname=testimg
The first measures your min possible latency - it does not scale with the
number of OSDs at all, but it's usually what real applications like DBMSes
need.
The second measures your max possible random write throughput which you
probably won't be able to utilize if you don't have enough VMs all writing
in parallel.
--
With best regards,
Vitaliy Filippov
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