Can Adaptec AIC-7902 do RAID-5?

[Kenneth D. Merry]

On Wed, Jul 23, 2003 at 10:45:10 +0200, Sheldon Hearn wrote:
> Hi folks,
> 
> I've been googling like crazy and have gotten mixed answers on the
> AIC-7902's RAID support.
> 
> The product spec says it can do RAID-0 and RAID-1.  Other articles show
> benchmarks involving RAID-5.  I'm concerned that this is software
> RAID-5, which won't do me any good at all for FreeBSD.
> 
> Any FreeBSD users using an AIC-7902 with 3 or more disks in a RAID-5
> configuration?

The RAID-0 and RAID-1 support (and RAID-10) is done in software.  The BIOS
on the -R cards understands RAID metadata and can boot from a RAID array.
After that, you need support for Adaptec RAID metadata from your OS
software RAID stack.

If you've seen RAID-5 numbers, they were from a software RAID stack.

Ken
-- 
Kenneth Merry
ken at kdm.org