hdparm -i /dev/sda1
/dev/sda1:
model=wdc wd10eacs-00zjb0
（硬碟型號） , fwrev=01.01b01, serialno= wd-wcasj0976997
config=
rawchs=16383/16/63, trksize=0, sectsize=0, eccbytes=50
bufftype=unknown, buffsize=16384kb（硬碟快取）, maxmultsect=16, multsect=?16?
curchs=16383/16/63, cursects=16514064, lba=yes, lbasects=268435455
iordy=on/off, tpio=, tdma=
pio modes: pio0 pio3 pio4
dma modes: mdma0 mdma1 mdma2
udma modes: udma0 udma1 udma2
advancedpm=no www.ctohome.com writecache=enabled
drive conforms to: unspecified: ata/atapi-1 ata/atapi-2 ata/atapi-3 ata/atapi-4 ata/atapi-5 ata/atapi-6 ata/atapi-7
* signifies the current active mode
[root@host96 www.ctohome.com]# hdparm -i /dev/sda1
/dev/sda1:
model=hitachi hdt721010sla360 , fwrev=st6oa31b, serialno= stf604mr2dg61p
config=
rawchs=16383/16/63, trksize=0, sectsize=0, eccbytes=56
bufftype=dualportcache, buffsize=15001kb, maxmultsect=16, multsect=?16?
curchs=16383/16/63, cursects=16514064, lba=yes, lbasects=268435455
iordy=on/off, tpio=, tdma=
pio modes: pio0 pio1 pio2 pio3 pio4
dma modes: mdma0 mdma1 mdma2
udma modes: udma0 udma1 udma2
advancedpm=yes: disabled (255) writecache=enabled
drive conforms to: unknown: ata/atapi-2 ata/atapi-3 ata/atapi-4 ata/atapi-5 ata/atapi-6 ata/atapi-7
* signifies the current active mode
linux/centos系統的伺服器如何用hdparm測試硬碟效能，測試硬碟速度？
[root@host88 www.ctohome.com]# hdparm -tt /dev/sda8
/dev/sda8:
timing cached reads: 8512 mb in 2.00 seconds = 4262.60 mb/sec
timing buffered disk reads: 222 mb in 3.02 seconds = 73.58 mb/sec
[root@host96 www.ctohome.com]# hdparm -tt /dev/sda2
/dev/sda2:
timing cached reads: 7684 mb in 2.00 seconds = 3848.10 mb/sec
timing buffered disk reads: 116 mb in 3.15 seconds = 36.82 mb/sec
注意，hdparm -tt 必須要在機器空閒的時候測試才準確，機器繁忙的時候是測不准的。如果有小於20mb/sec的結果，那麼磁碟的io效能就不怎麼樣了。
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