simple minded sprints with JackRabbit Flash

A quick and dirty test on a JackRabbit Flash machine. This is a machine going to a proof of concept project soon.

A simple 8k random read against 256GB data spread out over 4 volumes. 1 machine. 48GB ram.

Open up the throttle on the stock config. Engines aren’t running at full speed, but its a baseline test.

random: (groupid=0, jobs=256): err= 0: pid=18717
  read : io=262144MB, bw=733052KB/s, <strong>iops=91631</strong>, runt=366189msec
    clat (usec): min=296, max=184778, avg=2777.65, stdev=22.14
    bw (KB/s) : min=    5, max=16256, per=0.39%, avg=2878.49, stdev= 5.78
  cpu          : usr=0.16%, sys=1.08%, ctx=69011028, majf=1, minf=87227
  IO depths    : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >=64=0.0%
     submit    : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
     complete  : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
     issued r/w: total=33554432/0, short=0/0
     lat (usec): 500=0.02%, 750=0.02%, 1000=0.02%
     lat (msec): 2=0.13%, 4=99.63%, 10=0.16%, 20=0.01%, 50=0.01%
     lat (msec): 100=0.01%, 250=0.01%

Run status group 0 (all jobs):
   READ: io=262144MB, aggrb=733051KB/s, minb=750644KB/s, maxb=750644KB/s, mint=366189msec, maxt=366189msec

Disk stats (read/write):
  sdf: ios=16775284/0, merge=0/0, ticks=22949090/0, in_queue=22940080, util=24.97%
  sdh: ios=16776371/170953, merge=0/16346044, ticks=23011130/44960740, in_queue=67962970, util=47.32%
  sdg: ios=16776714/170877, merge=0/16346137, ticks=23010180/44923810, in_queue=67925390, util=63.18%
  sdi: ios=16774598/171025, merge=0/16345986, ticks=23002660/44961430, in_queue=67955380, util=95.08%

91k IOPs.

Not bad. But have to tune it a bit.

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