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Date:      Wed, 17 May 2000 10:30:24 -0700
From:      Mike Smith <msmith@freebsd.org>
To:        Mark Powell <M.S.Powell@salford.ac.uk>
Cc:        freebsd-stable@FreeBSD.ORG
Subject:   Re: MegaRAID compatible memory (was Re: HPDA/DAC960PL errors ) 
Message-ID:  <200005171730.KAA06913@mass.cdrom.com>
In-Reply-To: Your message of "Wed, 17 May 2000 16:47:35 BST." <Pine.BSF.4.21.0005171644380.45923-100000@plato.salford.ac.uk> 

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> > Any ideas on when the 1600 will be supported? I hate to pester such an
> > altruist, but the 1600 seems attractive due to the U160
> > support. Additionally the use of a DIMM for on-board memory rather than a
> > single sided SIMM. Our suppliers have been having trouble getting the
> > SIMMs for our current DPT SmartRAID IV controllers.

I'm sorry, I don't recall seeing this question the first time around; the 
short answer is that the 1600 will be supported shortly after someone 
gives/lends me one to do the work.  I have the necessary information, 
just no controller to test with.

> As an aside, anyone know what memory is compatible with the 1400
> controllers. I know AMI provide a list, but that stuff is difficult to get
> hold of. All the 64MB 72pin SIMMs they recommend are EDO. Anyone know
> whether they have to be just parity or ECC. Is there any difference? As
> long as they are 9bits wide? (I never have known the difference between
> memory advertised as ECC and parity :)

With byte-wide memory, you need two extra bits for ECC rather than just 
one for parity.  72-pin SIMMs are actually 32 bits wide; some controllers 
are happy with parity memory (36 bits), others want byte-ECC memory (eg. 
Mylex AcceleRAID) which is 40 bits wide and incredibly expensive.

I *think* the 1400 will be happy with just plain parity memory.  If in 
doubt, buy from a supplier with an exchange plan.

-- 
\\ Give a man a fish, and you feed him for a day. \\  Mike Smith
\\ Tell him he should learn how to fish himself,  \\  msmith@freebsd.org
\\ and he'll hate you for a lifetime.             \\  msmith@cdrom.com




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