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From: User Wojtek <wojtek@wojtek.tensor.gdynia.pl>
To: tess lamont <tesla@sunset.tx.net>
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Cc: freebsd-questions@freebsd.org
Subject: Re: Optiplex 755 RAID 1 logical drive configuration ignored by
 FreeBSD 9.0-R installation
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> the system setup menu, the boot menu shows that "freebsd90" is the first (and 
> only) bootable hard drive.
>
> Yet when I try to install FreeBSD 9.0-R, FreeBSD ignores the hardware RAID 
> and sees the two separate drives, instead of seeing a single logical drive.
>
good lesson to NEVER use this pseudo-RAID interfaces and use gmirror 
instead.

not only you can make more complex RAID setup, get higher performance from 
gmirror and be always able to access data independently of "hardware" RAID 
onboard which is just normal controller.

Just don't use BIOS RAID ever.