- libaio randwrite
- libaio randread
- libaio randwrite on mapped rbd
- libaio randread on mapped rbd
- rbd read
- rbd write
recheck RBD with RAND READ / RAND WRITE
you're again comparing RANDOM and NON-RANDOM I/O
your SSDs aren't that bad, 3000 single-thread iops isn't the worst
possible performance