Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!mit-eddie!uw-beaver!rice!sun-spots-request
From: laic!nova!hart@decwrl.dec.com (Howard C. Hart)
Newsgroups: comp.sys.sun
Subject: Re: 32MB on new Sparc Server?
Keywords: Hardware
Message-ID: <3512@kalliope.rice.edu>
Date: 22 May 89 18:48:11 GMT
Sender: usenet@rice.edu
Organization: Sun-Spots
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Approved: Sun-Spots@rice.edu
X-Sun-Spots-Digest: Volume 8, Issue 5, message 1 of 17

In article <3772@phri.UUCP> roy@phri.nyu.edu (Roy Smith) writes:
>X-Sun-Spots-Digest: Volume 7, Issue 297, message 1 of 18
>
><FLAME ON!>
>
>Alex is right, ECC can pinpoint the source of a memory error down to the
>specific chip which is failing.  With the proper (fairly trivial) logic in
>the memory management section of the OS, you could very will print out
>error messages saying "replace chip at position N-14 on board 3".  Even if
>

Now I get to show my ignorance of memory management. We've got a bad
memory board as I speak. When I run Sun's sysdiag on it, I get the
physical adress of the bad memory which pins it down to the 4th Sun memory
board (i.e. 3+ Mbytes). I'd assume to locate the bad chip, I'd just
subtract anything over 3 Mbytes and use the offset to calculate which of
the chips was bad. If there is some question as to which chip I start
counting from, I take a good chip, replace the suspect chip, and check the
memory again until I get it right. Lot's of work, but still doable. Did I
miss something fundamental?

>Now that I'm in a good mood :-), maybe somebody can tell me why I can buy
>a Mbyte of 100ns memory for a Mac-II for $160 but a Mbyte of memory for a
>Sun-3 costs more like $500, even from a third party like Clearpoint or

You might want to check with Clearpoint again. We're on GSA pricing and
we just bought Sun 3/60 memory for $180/Mbyte. I was told the price was
still going down when we bought. Wouldn't expect to see a serious
difference between GSA and normal (and that's with ECC!).

Howard C. Hart                  UUCP:{sun!sunncal,pyramid}!leadsv!laic!nova!hart
Lockheed Missiles and Space Co.
Orgn 59-53, Bldg 593            Ph: (408) 743-2253 or -7353