Ceph

loic@fold:~/software/ceph/ceph/src$ rados --pool rbd -b 4096 bench 5 write --no-cleanup --run-name try
 Maintaining 16 concurrent writes of 4096 bytes for up to 5 seconds or 0 objects
 Object prefix: benchmark_data_fold_20180
   sec Cur ops   started  finished  avg MB/s  cur MB/s  last lat   avg lat
     0       0         0         0         0         0         -         0
     1      16        67        51  0.199177  0.199219  0.327991  0.228371
     2      16       112        96  0.187461  0.175781  0.267772   0.32414
     3      16       147       131  0.170542  0.136719  0.211988  0.360128
     4      16       161       145  0.141577 0.0546875  0.994443  0.364593
     5      16       172       156  0.121854 0.0429688   1.32801  0.422482
 Total time run:         5.625777
Total writes made:      173
Write size:             4096
Bandwidth (MB/sec):     0.120 

Stddev Bandwidth:       0.0802827
Max bandwidth (MB/sec): 0.199219
Min bandwidth (MB/sec): 0
Average Latency:        0.512548
Stddev Latency:         0.411049
Max latency:            2.49627
Min latency:            0.154259
loic@fold:~/software/ceph/ceph/src$ rados --pool rbd -b 1024 bench 5 seq --no-cleanup --run-name try
   sec Cur ops   started  finished  avg MB/s  cur MB/s  last lat   avg lat
     0       0         0         0         0         0         -         0
 Total time run:        0.042500
Total reads made:     173
Read size:            4096
Bandwidth (MB/sec):    15.901 

Average Latency:       0.00387084
Max latency:           0.00833
Min latency:           0.000879