linux磁盘性能测试
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120-test:/# apt-get install hdparm
真实机器120上测试结果:
测试磁盘性能(不cache)
120-test:/home/lai# hdparm -t /dev/sda
/dev/sda:
Timing buffered disk reads: 346 MB in 3.02 seconds = 114.65 MB/sec
测试磁盘性能(带cache)
120-test:/home/lai# hdparm -T /dev/sda
/dev/sda:
Timing cached reads: 2786 MB in 2.00 seconds = 1393.80 MB/sec
真实机器121上测试结果:
121:~# hdparm -t /dev/sda
/dev/sda:
Timing buffered disk reads: 310 MB in 3.01 seconds = 102.89 MB/sec
121:~# hdparm -T /dev/sda
/dev/sda:
Timing cached reads: 2578 MB in 2.00 seconds = 1289.01 MB/sec
服务器sas硬盘测试结果:
lai@*:~$ sudo hdparm -t /dev/sda
/dev/sda:
Timing buffered disk reads: 442 MB in 3.01 seconds = 146.89 MB/sec
lai@*:~$ sudo hdparm -T /dev/sda
/dev/sda:
Timing cached reads: 8306 MB in 2.00 seconds = 4162.04 MB/sec
虚拟机的测试结果1:
HA:/home/lai# hdparm -t /dev/sda
/dev/sda:
Timing buffered disk reads: 176 MB in 3.01 seconds = 58.51 MB/sec
HA:/home/lai# hdparm -T /dev/sda
/dev/sda:
Timing cached reads: 2966 MB in 2.00 seconds = 1483.26 MB/sec
虚拟机的测试结果2:
153:/home/lai# hdparm -t /dev/sda
/dev/sda:
Timing buffered disk reads: 186 MB in 3.00 seconds = 61.93 MB/sec
153:/home/lai# hdparm -T /dev/sda
/dev/sda:
Timing cached reads: 3012 MB in 2.00 seconds = 1505.78 MB/sec
hdparm -c3 /dev/hda 开启硬盘32位
hdparm -d1 /dev/hda 开启DMA
setting drive read-lookahead to 0 (off)
look-ahead = 0 (off)
121:~# hdparm -tT /dev/sda
Timing cached reads: 2454 MB in 2.00 seconds = 1227.17 MB/sec
Timing buffered disk reads: 26 MB in 3.02 seconds = 8.60 MB/sec
开启预读
setting drive read-lookahead to 1 (on)
look-ahead = 1 (on)
121:~# hdparm -tT /dev/sda
Timing cached reads: 2586 MB in 2.00 seconds = 1293.30 MB/sec
Timing buffered disk reads: 312 MB in 3.00 seconds = 103.93 MB/sec
dd工具使用重要参数
HDparam是直接访问块设备, 所以本身没有受到cache的影响. 17MB/sec是你硬盘的真正顺序访问的吞吐能力.
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