1.用Linux自带的命令dd测试硬盘IO，如下
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写：
[root@server102 ~]# time dd if=/dev/zero bs= count= of=/tmp/1Gb.file
+ records in
+ records out
bytes (1.0 GB) copied, 2.28729 s, MB/s real 0m2.375s
user 0m0.079s
sys 0m2.028s
读：
[root@server102 ~]# time dd if=/tmp/1Gb.file bs=64k |dd of=/dev/null
+ records in
+ records out
bytes (1.0 GB) copied, 1.27014 s, MB/s
+ records in
+ records out
bytes (1.0 GB) copied, 1.27062 s, MB/s real 0m1.272s
user 0m0.163s
sys 0m1.763s
2.第二种方法
[root@dbserver01 email_info]# hdparm -Tt /dev/sda /dev/sda:
Timing cached reads: MB in 2.00 seconds = 7935.60 MB/sec
Timing buffered disk reads: MB in 3.01 seconds = 483.98 MB/sec