Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cornell!parmelee
From: parmelee@wayback.cs.cornell.edu (Larry Parmelee)
Newsgroups: comp.unix.questions
Subject: Re: WRT Disk errors on 11/750 running 4.3 BSD
Keywords: memory controller,memory,disk,11/750,vax,4.3
Message-ID: <30219@cornell.UUCP>
Date: 22 Jul 89 00:08:55 GMT
References: <117@egrunix.UUCP>
Sender: nobody@cornell.UUCP
Reply-To: parmelee@wayback.cs.cornell.edu (Larry Parmelee)
Organization: Cornell Univ. CS Dept, Ithaca NY
Lines: 16

In article <117@egrunix.UUCP> hacker@egrunix.UUCP (Thomas J Hacker) writes:

> > Jul 11 18:07:30 unix vmunix: mcr0: soft ecc addr 1a72 syn 73

> "addr" and the following number, "1a72", can be used to figure
> out which board was failing.  You need to know how much memory is
> on each board, and multiply the "1a72" number by 4, since the ecc
> logic looks at memory in 4-byte chunks:  (1a72*4) mod (bytes per board)
> gives you the board number which had the error.  Unfortunately I'm
> not sure how the boards are laid out in a 750.

Opps.  I just read what I wrote, and realized I meant "div" - Integer
division, not "mod":   (1a72*4) div (bytes per board).  Oh well.

-Larry Parmelee
parmelee@cs.cornell.edu