benchmarking the storages: iSCSI Enterprise Target (+Software RAID0)

Posted on by Daniel Kirstenpfad

This time we got a Software RAID0 Volume with 2 drives which made a volume size of 976784130 sectors = 476945 Megabyte. This Volume is exported with the iSCSI Enterprise Target Software for Linux.

You may ask: Why only 2 drives this time? – The answer: The guy who did the setup of the linux machine did not know how to delete the RAID5 volume he created for the previous benchmark. So there where only 2 250 Gigabyte drives left…and yes: we sometimes have a subliminal feeling that we have to hurt him.

Interface-Transferrate with a blocksize of 128 sectors at 0.0 percent of the capacity:

sequential read rate medium (unthrottled): 65399 Kilobyte/s
sequential read rate Read-Ahead (Latency 1.08 ms): 67237 Kilobyte/s
repeatedly sequential read (“coretest”): 55854 Kilobyte/s

permanent transfer rate: (blocksize: 128 sectors):
read:

  • Average: 54098.5 Kilobyte/s
  • Minimum: 51692.8 Kilobyte/s
  • Maximum: 54530.8 Kilobyte/s

write:

  • Average: 30086.6 Kilobyte/s
  • Minimum: 29700.0 Kilobyte/s
  • Maximum: 30895.6 Kilobyte/s

access time read:

  • Average: 13.61 ms
  • Minimum: 0.11 ms
  • Maximum: 26.78 ms

access time write:

  • Average: 15.70 ms
  • Minimum: 0.36 ms
  • Maximum: 41.20 ms

access time read (<504 MByte):

  • Average: 6.22 ms
  • Minimum: 0.11 ms
  • Maximum: 21.31 ms

access time write (<504 MByte):

  • Average: 7.31 ms
  • Minimum: 0.29 ms
  • Maximum: 26.66 ms