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52 sudo mdadm --create /dev/md0 -l 0 -n 4 /dev/sdi1 /dev/sdj1 /dev/sdk1 /dev/sdl1
53 sudo mkfs.xfs /dev/md0
54 sudo mount /dev/md0 /mnt/sdi
55 cd /mnt/sdi
56 ls
57 sudo fio ~/rw5050.fio
atobey@zorak /mnt/sdi $ sudo fio ~/rw5050.fio
rw5050: (g=0): rw=randrw, bs=4K-4K/4K-4K/4K-4K, ioengine=libaio, iodepth=32
...
fio-2.1.9
Starting 4 processes
rw5050: Laying out IO file(s) (1 file(s) / 25600MB)
rw5050: Laying out IO file(s) (1 file(s) / 25600MB)
rw5050: Laying out IO file(s) (1 file(s) / 25600MB)
rw5050: Laying out IO file(s) (1 file(s) / 25600MB)
Jobs: 3 (f=3): [ff_f] [100.0% done] [0KB/0KB/0KB /s] [0/0/0 iops] [eta 00m:00s]
rw5050: (groupid=0, jobs=4): err= 0: pid=1011: Tue Jun 17 20:20:23 2014
Description : ["random 50/50"]
read : io=108895MB, bw=185847KB/s, iops=46461, runt=600004msec
slat (usec): min=26, max=6356, avg=65.39, stdev=102.89
clat (usec): min=0, max=682139, avg=1357.79, stdev=1971.76
lat (usec): min=76, max=682173, avg=1423.35, stdev=1975.36
clat percentiles (usec):
| 1.00th=[ 137], 5.00th=[ 191], 10.00th=[ 251], 20.00th=[ 374],
| 30.00th=[ 502], 40.00th=[ 668], 50.00th=[ 884], 60.00th=[ 1176],
| 70.00th=[ 1608], 80.00th=[ 2224], 90.00th=[ 2992], 95.00th=[ 3728],
| 99.00th=[ 5536], 99.50th=[ 7968], 99.90th=[17280], 99.95th=[20352],
| 99.99th=[25728]
bw (KB /s): min= 4, max=59448, per=25.02%, avg=46496.27, stdev=4360.87
write: io=108943MB, bw=185928KB/s, iops=46481, runt=600004msec
slat (usec): min=26, max=6358, avg=65.72, stdev=103.52
clat (usec): min=0, max=680881, avg=1247.52, stdev=2001.07
lat (usec): min=55, max=680917, avg=1313.42, stdev=2004.50
clat percentiles (usec):
| 1.00th=[ 87], 5.00th=[ 153], 10.00th=[ 197], 20.00th=[ 302],
| 30.00th=[ 430], 40.00th=[ 580], 50.00th=[ 772], 60.00th=[ 1048],
| 70.00th=[ 1432], 80.00th=[ 2024], 90.00th=[ 2832], 95.00th=[ 3632],
| 99.00th=[ 5408], 99.50th=[ 7776], 99.90th=[17280], 99.95th=[20352],
| 99.99th=[25728]
bw (KB /s): min= 4, max=59592, per=25.02%, avg=46516.07, stdev=4355.41
lat (usec) : 2=0.03%, 4=0.05%, 10=0.01%, 20=0.01%, 50=0.07%
lat (usec) : 100=0.59%, 250=11.89%, 500=19.81%, 750=14.04%, 1000=9.94%
lat (msec) : 2=21.84%, 4=18.06%, 10=3.34%, 20=0.28%, 50=0.05%
lat (msec) : 100=0.01%, 750=0.01%
cpu : usr=1.69%, sys=12.11%, ctx=40033328, majf=0, minf=53671
IO depths : 1=0.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.1%, 32=100.8%, >=64=0.0%
submit : 0=0.0%, 4=0.0%, 8=0.0%, 16=100.0%, 32=0.0%, 64=0.0%, >=64=0.0%
complete : 0=0.0%, 4=0.0%, 8=0.0%, 16=100.0%, 32=0.0%, 64=0.0%, >=64=0.0%
issued : total=r=27877096/w=27889384/d=0, short=r=0/w=0/d=0
latency : target=0, window=0, percentile=100.00%, depth=32
Run status group 0 (all jobs):
READ: io=108895MB, aggrb=185846KB/s, minb=185846KB/s, maxb=185846KB/s, mint=600004msec, maxt=600004msec
WRITE: io=108943MB, aggrb=185928KB/s, minb=185928KB/s, maxb=185928KB/s, mint=600004msec, maxt=600004msec
Disk stats (read/write):
md0: ios=28108078/28127429, merge=0/0, ticks=0/0, in_queue=0, util=0.00%, aggrios=7027005/7031877, aggrmerge=14/19, aggrticks=7008906/6324628, aggrin_queue=13332993, aggrutil=90.95%
sdi: ios=7029934/7028869, merge=11/28, ticks=7502050/7304213, in_queue=14806603, util=90.85%
sdj: ios=7025591/7038437, merge=18/13, ticks=7486180/7299860, in_queue=14785483, util=90.95%
sdk: ios=7024992/7030193, merge=12/21, ticks=7328173/7127733, in_queue=14456030, util=90.34%
sdl: ios=7027505/7030011, merge=15/17, ticks=5719223/3566707, in_queue=9283857, util=85.48%
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