ubuntu@disk-test:~/iozone3_420/src/current$ fio --rw=randread --ioengine=libaio --direct=1 --numjobs=1 --bs=4k --runtime=60 --size=5G --runtime=60 --iodepth=16 --name=/mnt/vol/fio.dat
/mnt/vol/fio.dat: (g=0): rw=randread, bs=4K-4K/4K-4K, ioengine=libaio, iodepth=16
fio 1.59
Starting 1 process
Jobs: 1 (f=1): [r] [100.0% done] [20148K/0K /s] [4919 /0  iops] [eta 00m:00s]
/mnt/vol/fio.dat: (groupid=0, jobs=1): err= 0: pid=6649
  read : io=1719.2MB, bw=29337KB/s, iops=7334 , runt= 60002msec
    slat (usec): min=4 , max=980 , avg=17.39, stdev=16.58
    clat (usec): min=550 , max=641890 , avg=2159.56, stdev=7340.48
     lat (usec): min=615 , max=641896 , avg=2177.85, stdev=7340.39
    bw (KB/s) : min= 8904, max=36232, per=100.25%, avg=29408.51, stdev=4976.74
  cpu          : usr=5.23%, sys=18.35%, ctx=96868, majf=0, minf=37
  IO depths    : 1=0.1%, 2=0.1%, 4=0.1%, 8=0.1%, 16=100.0%, 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=0.1%, 32=0.0%, 64=0.0%, >=64=0.0%
     issued r/w/d: total=440067/0/0, short=0/0/0
     lat (usec): 750=0.09%, 1000=2.31%
     lat (msec): 2=50.68%, 4=46.79%, 10=0.03%, 20=0.01%, 50=0.01%
     lat (msec): 100=0.01%, 250=0.03%, 500=0.03%, 750=0.01%

Run status group 0 (all jobs):
   READ: io=1719.2MB, aggrb=29336KB/s, minb=30040KB/s, maxb=30040KB/s, mint=60002msec, maxt=60002msec

Disk stats (read/write):
  vdb: ios=439896/0, merge=0/0, ticks=903804/0, in_queue=903512, util=99.94%