Last monday I performed a quick test with those two disks already, probably not that relevant, but posting it anyway: I created a two-disk ceph 'cluster' on just the one local node, and ran the following:
root@ceph:~# rados bench -p scbench 10 write --no-cleanup hints = 1 Maintaining 16 concurrent writes of 4194304 bytes to objects of size 4194304 for up to 10 seconds or 0 objects Object prefix: benchmark_data_ceph_48906 sec Cur ops started finished avg MB/s cur MB/s last lat(s) avg lat(s) 0 0 0 0 0 0 - 0 1 16 107 91 363.961 364 0.0546517 0.155121 2 16 206 190 379.948 396 0.1529 0.159227 3 16 324 308 410.614 472 0.0972163 0.151421 4 16 458 442 441.942 536 0.0484349 0.141799 5 16 590 574 459.141 528 0.0445051 0.136922 6 16 727 711 473.941 548 0.181066 0.134468 7 16 856 840 479.941 516 0.187683 0.133199 8 16 970 954 476.942 456 0.070753 0.132642 9 16 1089 1073 476.831 476 0.193608 0.133754 10 16 1214 1198 479.142 500 0.0999212 0.132529 Total time run: 10.097218 Total writes made: 1215 Write size: 4194304 Object size: 4194304 Bandwidth (MB/sec): 481.321 Stddev Bandwidth: 60.481 Max bandwidth (MB/sec): 548 Min bandwidth (MB/sec): 364 Average IOPS: 120 Stddev IOPS: 15 Max IOPS: 137 Min IOPS: 91 Average Latency(s): 0.132889 Stddev Latency(s): 0.0645579 Max latency(s): 0.336118 Min latency(s): 0.0117049
Do let me know what else you'd want me to do. MJ