ubuntu@disk-test:~/iozone3_420/src/current$ fio --rw=randread --ioengine=libaio --direct=1 --numjobs=1 --bs=4k --runtime=60 --size=5G --runtime=60 --name=/mnt/vol/fio.dat
/mnt/vol/fio.dat: (g=0): rw=randread, bs=4K-4K/4K-4K, ioengine=libaio, iodepth=1
fio 1.59
Starting 1 process
Jobs: 1 (f=1): [r] [100.0% done] [2442K/0K /s] [596 /0  iops] [eta 00m:00s]
/mnt/vol/fio.dat: (groupid=0, jobs=1): err= 0: pid=6616
  read : io=170380KB, bw=2839.7KB/s, iops=709 , runt= 60001msec
    slat (usec): min=10 , max=577 , avg=20.41, stdev=12.70
    clat (usec): min=395 , max=5306 , avg=1383.89, stdev=340.56
     lat (usec): min=556 , max=5317 , avg=1405.01, stdev=344.23
    bw (KB/s) : min= 2136, max= 3280, per=100.20%, avg=2844.75, stdev=327.64
  cpu          : usr=0.56%, sys=2.42%, ctx=42756, majf=0, minf=22
  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/d: total=42595/0/0, short=0/0/0
     lat (usec): 500=0.01%, 750=4.16%, 1000=11.35%
     lat (msec): 2=81.62%, 4=2.86%, 10=0.01%

Run status group 0 (all jobs):
   READ: io=170380KB, aggrb=2839KB/s, minb=2907KB/s, maxb=2907KB/s, mint=60001msec, maxt=60001msec

Disk stats (read/write):
  vdb: ios=42565/0, merge=0/0, ticks=58404/0, in_queue=58368, util=97.28%