AHCI driver

Victor Ophof mr4hughz at hotmail.com
Tue Aug 10 12:37:44 UTC 2010

Its better to enable, 

but AD4 can get renamed to ada0 

but it's easy to fix (when reboot keep a 2nd computer handy to google the solution) 

you just need to edit the /etc/fstab to point to the newly named drives .. 
> Date: Tue, 10 Aug 2010 13:36:11 +0200
> From: dick at nagual.nl
> To: freebsd-questions at freebsd.org
> Subject: AHCI driver
> I'm told it would be better to enable the AHCI driver form my SATA2 
> drives. It would make ZFS perform better on them. From the release notes 
> I get:
> FreeBSD cam(3) 
> <http://www.FreeBSD.org/cgi/man.cgi?query=cam&sektion=3&manpath=FreeBSD+8.1-RELEASE> 
> SCSI framework has been improved and a new kernel option |option 
> ATA_CAM| has been added. This turns ata(4) 
> <http://www.FreeBSD.org/cgi/man.cgi?query=ata&sektion=4&manpath=FreeBSD+8.1-RELEASE> 
> controller drivers into cam(4) 
> <http://www.FreeBSD.org/cgi/man.cgi?query=cam&sektion=4&manpath=FreeBSD+8.1-RELEASE> 
> interface modules. When enabled, this option deprecates all ata(4) 
> <http://www.FreeBSD.org/cgi/man.cgi?query=ata&sektion=4&manpath=FreeBSD+8.1-RELEASE> 
> peripheral drivers and interfaces such as ad and acd, and allows cam(4) 
> <http://www.FreeBSD.org/cgi/man.cgi?query=cam&sektion=4&manpath=FreeBSD+8.1-RELEASE> 
> drivers ada, and cd and interfaces to be natively used instead. Note 
> that this is not enabled by default in the GENERIC kernel.
> Is it really better to enable AHCI driver?
> Will I be able to GEOM label normal disks (like /dev/ad0) or do I need 
> /dev/ada0 drives for that?
> Thanks for any help / advice on this matter. I'm building the server and 
> want to do things right from the start.
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