Hi Felix,

Better use fio.

Like fio -ioengine=rbd -direct=1 -invalidate=1 -name=test -bs=4k -iodepth=128 
-rw=randwrite -pool=rpool_hdd -runtime=60 -rbdname=testimg (for peak parallel 
random iops)

Or the same with -iodepth=1 for the latency test. Here you usually get

Or the same with -ioengine=libaio -filename=testfile -size=10G instead of 
-ioengine=rbd -pool=.. -rbdname=.. to test it from inside a VM.

...or the same with -sync=1 to determine how a DBMS will perform inside a VM...
-- 
With best regards,
  Vitaliy Filippov
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