120-test:/# apt-get install hdparm
真實機器120上測試結果：
測試磁碟效能（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
測試磁碟效能（帶cache）
120-test:/home/lai# hdparm -t /dev/sda
/dev/sda:
timing cached reads: 2786 mb in 2.00 seconds = 1393.80 mb/sec
真實機器121上測試結果：
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
伺服器sas硬碟測試結果：
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
虛擬機器的測試結果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
虛擬機器的測試結果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優化硬碟
hdparm -tt /dev/hda 測試硬碟速度
hdparm -a1 /dev/hda 開啟硬碟預讀取功能
hdparm -c3 /dev/hda 開啟硬碟32位
hdparm -d1 /dev/hda 開啟dma
－d 和 －a 引數對ide硬碟讀寫效能影響最大（尤 －d）
關閉預讀
121:~# hdparm -a 0 /dev/sda
/dev/sda:
setting drive read-lookahead to 0 (off)
look-ahead = 0 (off)
121:~# hdparm -tt /dev/sda
/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
開啟預讀
121:~# hdparm -a 1 /dev/sda
/dev/sda:
setting drive read-lookahead to 1 (on)
look-ahead = 1 (on)
121:~# hdparm -tt /dev/sda
/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
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