Linux uses FIO to test disk Iops__linux

http://blog.csdn.net/card_2005/article/details/8765769

Fio is a very good tool for testing iops to stress test and verify hardware, supporting 13 different I/O engines, including: Sync,mmap, Libaio, Posixaio, SG v3, splice, NULL, network, Syslet, Guasi, Solarisaio and so on.
FIO Official website address: http://freshmeat.net/projects/fio/

One, FIO installation
wget http://brick.kernel.dk/snaps/fio-2.0.7.tar.gz
Yum Install Libaio-devel
TAR-ZXVF fio-2.0.7.tar.gz
CD fio-2.0.7
Make
Make install

Second, FIO usage:

Random reads:
Fio-filename=/dev/sdb1-direct=1-iodepth 1-thread-rw=randread-ioengine=psync-bs=16k-size=200g-numjobs=10-runtime =1000-group_reporting-name=mytest

Description
FILENAME=/DEV/SDB1 test file name, usually select the data directory of the disk you want to test.
The Direct=1 test process bypasses the machine's own buffer. Make the test results more realistic.
Rw=randwrite test for randomly written I/O
RW=RANDRW test Random Write and read I/O
bs=16k Single IO block file size is 16k
bsrange=512-2048, the size range of the data block
size=5g The test file size is 5g and tested at each 4k IO.
NUMJOBS=30 the test thread for this time is 30.
runtime=1000 test time is 1000 seconds, if not write the 5g file will be divided into 4k every time you finish writing.
Ioengine=psync IO engine uses Pync method
Rwmixwrite=30 in mixed read-write mode, write accounted for 30%
Group_reporting about displaying the results, summarize the information for each process.

Furthermore
LOCKMEM=1G only uses 1g of memory for testing.
Zero_buffers uses 0 to initialize the system buffer.
Nrfiles=8 the number of files generated per process.

Sequential reads:
Fio-filename=/dev/sdb1-direct=1-iodepth 1-thread-rw=read-ioengine=psync-bs=16k-size=200g-numjobs=30-runtime=100 0-group_reporting-name=mytest

Random write:
Fio-filename=/dev/sdb1-direct=1-iodepth 1-thread-rw=randwrite-ioengine=psync-bs=16k-size=200g-numjobs=30-runtim E=1000-group_reporting-name=mytest

Sequential write:
Fio-filename=/dev/sdb1-direct=1-iodepth 1-thread-rw=write-ioengine=psync-bs=16k-size=200g-numjobs=30-runtime=10 00-group_reporting-name=mytest

Mixed random Read and write:
Fio-filename=/dev/sdb1-direct=1-iodepth 1-thread-rw=randrw-rwmixread=70-ioengine=psync-bs=16k-size=200g-numjobs =30-runtime=100-group_reporting-name=mytest-ioscheduler=noop

Third, the actual test example:

[Root@localhost ~]# fio-filename=/dev/sdb1-direct=1-iodepth 1-thread-rw=randrw-rwmixread=70-ioengine=psync-bs=16k -size=200g-numjobs=30-runtime=100-group_reporting-name=mytest1
Mytest1: (g=0): RW=RANDRW, bs=16k-16k/16k-16k, Ioengine=psync, iodepth=1
...
Mytest1: (g=0): RW=RANDRW, bs=16k-16k/16k-16k, Ioengine=psync, iodepth=1
Fio 2.0.7
Starting Threads
Jobs:1 (f=1): [________________m_____________] [3.5% done] [6935k/3116k/s] [423/190 IOPS] [eta 48m:20s] s]
Mytest1: (Groupid=0, jobs=30): err= 0:pid=23802
READ:IO=1853.4MB,bw=18967kb/s, iops=1185, runt=100058msec
Clat (USEC): min=60, max=871116, avg=25227.91, stdev=31653.46
Lat (usec): min=60, max=871117, avg=25228.08, stdev=31653.46
Clat percentiles (msec):
| 1.00th=[3], 5.00th=[5], 10.00th=[6], 20.00th=[8],
| 30.00th=[], 40.00th=[], 50.00th=[], 60.00th=[19],
| 70.00th=[], 80.00th=[, 90.00th=[], 95.00th=[79],
| 99.00th=[151], 99.50th=[, 99.90th=[338], 99.95th=[383],
| 99.99th=[523]
BW (KB/S): min=, max= 1944, per=3.36%, avg=636.84, stdev=189.15
WRITE:IO=803600KB,bw=8031.4kb/s, iops=501, runt=100058msec
Clat (USEC): min=52, max=9302, avg=146.25, stdev=299.17
Lat (usec): min=52, max=9303, avg=147.19, stdev=299.17
Clat percentiles (USEC):
| 1.00th=[], 5.00th=[, 10.00th=[], 20.00th=[74],
| 30.00th=[], 40.00th=[, 50.00th=[], 60.00th=[90],
| 70.00th=[], 80.00th=[, 90.00th=[], 95.00th=[370],
| 99.00th=[1688], 99.50th=[2128], 99.90th=[3088], 99.95th=[3696],
| 99.99th=[5216]
BW (KB/S): min=, max= 1117, per=3.37%, avg=270.27, stdev=133.27
Lat (usec): 100=24.32%, 250=3.83%, 500=0.33%, 750=0.28%, 1000=0.27%
Lat (msec): 2=0.64%, 4=3.08%, 10=20.67%, 20=19.90%, 50=17.91%
Lat (msec): 100=6.87%, 250=1.70%, 500=0.19%, 750=0.01%, 1000=0.01%
cpu:usr=1.70%, sys=2.41%, ctx=5237835, majf=0, minf=6344162
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=118612/w=50225/d=0, Short=r=0/w=0/d=0

Run Status Group 0 (all jobs):
READ:IO=1853.4MB, aggrb=18966kb/s, minb=18966kb/s, maxb=18966kb/s, Mint=100058msec, maxt=100058msec
WRITE:IO=803600KB, aggrb=8031kb/s, minb=8031kb/s, maxb=8031kb/s, Mint=100058msec, maxt=100058msec

Disk stats (read/write):
sdb:ios=118610/50224, merge=0/0, ticks=2991317/6860, in_queue=2998169, util=99.77%

Main view the ioPS of the Red font section above