Date: Wed, 23 Jul 2003 09:06:00 -0600 From: Scott Long <scottl@freebsd.org> To: Sheldon Hearn <sheldonh@starjuice.net> Cc: freebsd-scsi@freebsd.org Subject: Re: Can Adaptec AIC-7902 do RAID-5? Message-ID: <3F1EA458.3020106@freebsd.org> In-Reply-To: <20030723084510.GC32528@starjuice.net> References: <20030723084510.GC32528@starjuice.net>
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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? > > Thanks, > Sheldon. A 7902 by itself is _just_ a scsi chip. Any RAID functionality comes either from software drivers or extra hardware[1]. Adaptec has two product lines involving the 7902 chip and RAID. The 'HostRAID' line is just a standard 7902 combined with software RAID drivers for levels 0, 1, and 10, and a BIOS that supports booting off of these levels. The 2200S and 2120S cards are hardware RAID and can do 0, 1, 5, 10, and 50. Scott [1] The marketing literature for the 7902 will say that it contains features that accelerate RAID 1. This still means that it has to have a software driver doing the rest of the work.
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