Linux 下用 haparm 測試硬碟效能
hdparm -d0 /dev/sda1
/dev/sda1:
setting using_dma to 0 (off)
/etc/rc.d/rc.local 最後面加上一行 /sbin/hdparm -d1 -c3 -m16 /dev/hda 這樣每次開機後，硬碟的 DMA 就會開啟，不必每次手動設定。
hdparm -d0 /dev/sda1
/dev/sda1:
setting using_dma to 1 (on)
hdparm -tT /dev/sda1
/dev/sda1:
Timing cached reads: 4778 MB in 2.00 seconds = 2392.92 MB/sec
Timing buffered disk reads: 100 MB in 0.74 seconds = 135.26 MB/sec
如果出現 HDIO_SET_DMA failed: Inappropriate ioctl for device，下載 hdparm
# tar -zxvf hdparm-9.9.tar.gz
# cd hdparm-9.9
# make
# make install
