nwatkins@issdm-23:~/Projects/hadoop-0.20.205.0$ rados -p rbd bench 120 write
Maintaining 16 concurrent writes of 4194304 bytes for at least 120 seconds.
  sec Cur ops   started  finished  avg MB/s  cur MB/s  last lat   avg lat
    0       0         0         0         0         0         -         0
    1      16        16         0         0         0         -         0
    2      16        16         0         0         0         -         0
    3      16        16         0         0         0         -         0
    4      16        16         0         0         0         -         0
    5      16        16         0         0         0         -         0
    6      16        16         0         0         0         -         0
    7      16        16         0         0         0         -         0
    8      16        16         0         0         0         -         0
    9      16        16         0         0         0         -         0
   10      16        16         0         0         0         -         0
   11      16        16         0         0         0         -         0
   12      16        16         0         0         0         -         0
   13      16        16         0         0         0         -         0
   14      16        16         0         0         0         -         0
   15      16        16         0         0         0         -         0
   16      16        16         0         0         0         -         0
   17      16        16         0         0         0         -         0
   18      16        16         0         0         0         -         0
   19      16        16         0         0         0         -         0