[CentOS] AHCI support in CentOS 5.2?

lucian at lastdot.org lucian at lastdot.org
Sun Feb 8 12:18:06 UTC 2009


On 02/08/2009 10:57 AM, Marko Vojinovic wrote:
> My friend has an external sata hard disk, and likes the hot-plug feature.
> However, that works only if the appropriate sata setting in the motherboard
> bios is set to AHCI (IDE compatibility and RAID are two other options, but
> hot-plugging doesn't work with them). The machine has WinXP atm, while Linux
> is about to be installed in the following couple of days.
>
> Now, on wikipedia I read that AHCI is supported starting from kernel 2.6.19
> and later, while current CentOS 5.2 has 2.6.18. Is it possible to make AHCI
> work under 2.6.18 or should I install Fedora instead?

AFAIK, Centos5 (RHEL5) has support for this in kernel.

$grep SATA /boot/config-2.6.18-92.el5
CONFIG_SATA_AHCI=m

>
> Fedora will become obsolete in a year or so, and I will not be around to
> reinstall it again for him, so I would prefer a long-term solution (CentOS).
> But  I need to be sure that it can be made to do all that fancy
> hot-plug-auto-mount-sata-ahci stuff without too much hassle.
>
> Oh, btw, I am talking about hot-plugging using the sata cable --- usb
> connection of course already works, but this is a hard disk and speed
> increase is highly nontrivial when using sata connection compared to usb.
>
> Any suggestions?
>
> Thanks! :-)
> Marko
>
>
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