TEST-1: Sequential writes
-------------------------

Add config options in a text file (see `man fio` for details):

    $ cat seq-write.fio 
    [writes]
    rw=write
    ioengine=psync
    bs=512
    filename=/export/iotests/fio-test1
    time_based
    runtime=30
    size=256k

Run the `fio` test:

    $ fio seq-write.fio 
    writes: (g=0): rw=write, bs=512-512/512-512/512-512, ioengine=psync, iodepth=1
    fio-2.2.8
    Starting 1 process
    writes: Laying out IO file(s) (1 file(s) / 0MB)
    Jobs: 1 (f=1): [W(1)] [100.0% done] [0KB/338.8MB/0KB /s] [0/694K/0 iops] [eta 00m:00s]
    writes: (groupid=0, jobs=1): err= 0: pid=32387: Thu Jan 21 12:52:16 2016
      write: io=10149MB, bw=346409KB/s, iops=692817, runt= 30000msec
        clat (usec): min=1, max=81, avg= 1.08, stdev= 0.28
         lat (usec): min=1, max=81, avg= 1.13, stdev= 0.35
        clat percentiles (usec):
         |  1.00th=[    1],  5.00th=[    1], 10.00th=[    1], 20.00th=[    1],
         | 30.00th=[    1], 40.00th=[    1], 50.00th=[    1], 60.00th=[    1],
         | 70.00th=[    1], 80.00th=[    1], 90.00th=[    1], 95.00th=[    2],
         | 99.00th=[    2], 99.50th=[    2], 99.90th=[    3], 99.95th=[    4],
         | 99.99th=[    5]
        bw (KB  /s): min=335779, max=347282, per=100.00%, avg=346405.97, stdev=1453.82
        lat (usec) : 2=92.32%, 4=7.61%, 10=0.07%, 20=0.01%, 50=0.01%
        lat (usec) : 100=0.01%
      cpu          : usr=33.05%, sys=66.95%, ctx=19, majf=0, minf=82
      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    : total=r=0/w=20784537/d=0, short=r=0/w=0/d=0, drop=r=0/w=0/d=0
         latency   : target=0, window=0, percentile=100.00%, depth=1
    
    Run status group 0 (all jobs):
      WRITE: io=10149MB, aggrb=346408KB/s, minb=346408KB/s, maxb=346408KB/s, mint=30000msec, maxt=30000msec
    
    Disk stats (read/write):
      sdb: ios=0/12, merge=0/15, ticks=0/94, in_queue=94, util=0.31%



TEST-2: Random writes
---------------------

Config options:

    $ cat rand-write.fio
    [writes]
    rw=randwrite
    ioengine=psync
    bs=512
    filename=/export/iotests/fio-test2
    time_based
    runtime=30
    size=256k

Run `fio` with the above config options:

    $ fio rand-write.fio
    writes: (g=0): rw=randwrite, bs=512-512/512-512/512-512, ioengine=psync, iodepth=1
    fio-2.2.8
    Starting 1 process
    ^Cbs: 1 (f=1): [w(1)] [22.6% done] [0KB/298.5MB/0KB /s] [0/610K/0 iops] [eta 00m:24s]
    fio: terminating on signal 2
    
    writes: (groupid=0, jobs=1): err= 0: pid=32450: Thu Jan 21 12:57:16 2016
      write: io=2055.6MB, bw=310609KB/s, iops=621218, runt=  6775msec
        clat (usec): min=1, max=366, avg= 1.11, stdev= 0.90
         lat (usec): min=1, max=367, avg= 1.16, stdev= 0.92
        clat percentiles (usec):
         |  1.00th=[    1],  5.00th=[    1], 10.00th=[    1], 20.00th=[    1],
         | 30.00th=[    1], 40.00th=[    1], 50.00th=[    1], 60.00th=[    1],
         | 70.00th=[    1], 80.00th=[    1], 90.00th=[    2], 95.00th=[    2],
         | 99.00th=[    2], 99.50th=[    2], 99.90th=[    3], 99.95th=[    4],
         | 99.99th=[    6]
        bw (KB  /s): min=297402, max=316541, per=99.95%, avg=310467.00, stdev=6506.75
        lat (usec) : 2=89.25%, 4=10.68%, 10=0.07%, 20=0.01%, 50=0.01%
        lat (usec) : 100=0.01%, 250=0.01%, 500=0.01%
      cpu          : usr=37.57%, sys=62.27%, ctx=73, majf=0, minf=41
      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    : total=r=0/w=4208754/d=0, short=r=0/w=0/d=0, drop=r=0/w=0/d=0
         latency   : target=0, window=0, percentile=100.00%, depth=1
    
    Run status group 0 (all jobs):
      WRITE: io=2055.6MB, aggrb=310609KB/s, minb=310609KB/s, maxb=310609KB/s, mint=6775msec, maxt=6775msec
    
    Disk stats (read/write):
      sdb: ios=64/8, merge=0/2, ticks=11/11, in_queue=22, util=0.33%