Linear reads, `hdparm -t /dev/vda`.

Check if you have `cache=writeback` enabled in your VM options.

If it's enabled but you still get 5mb/s then try to benchmark your cluster with fio -ioengine=rbd from outside a VM.

Like

fio -ioengine=rbd -name=test -bs=4M -iodepth=16 -rw=read -pool=rpool -runtime=60 -rbdname=testimg

--
With best regards,
  Vitaliy Filippov
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