ahci & ata and NCQ

Note that in FreeBSD 8.0 there is new driver called ahci(4), which uses CAM (previously used only by SCSI drives) instead of the old ata(4) infrastructure. One of the advantages over ata(4) is the efficient use of NCQ. This is still being improved in FreeBSD-CURRENT, but what's in 8.0 works very well already.



摘录：ahci应用

昨天在桌機上裝了一下 freebsd 8,

順手把這個打開來用用看, 果然用起來沒問題呀.


安裝光碟, 預設還是 ata, 所以得裝完之後, 自己在 /boot/loader.conf 加上 ahci_loader="YES",

然後 修改 /etc/fstab 之後, 重開機就可以使用 ahci 了, 當然, 硬體跟 bios 都要有支援就是, 有的 bios 預設就是 ata, 要自己進去改一下,

不然怎樣搞都還是進不了 ahci mode.

--
ata 硬碟的命名是 adX, ahci 則是 adaX, 所以 fstab 得自己改過.

转自：http://blog.fatpipi.com/2009/10/freebsd-ahci.html