Path: utzoo!utgpu!water!watmath!clyde!rutgers!super.upenn.edu!hyper.lap.upenn.edu!adam
From: adam@hyper.lap.upenn.edu (Adam Feigin)
Newsgroups: comp.sys.apollo
Subject: DSP90/MSD-500 Disk Errors
Keywords: MSD-500, disk block header errors, madness
Message-ID: <3370@super.upenn.edu>
Date: 14 Feb 88 15:18:32 GMT
Sender: news@super.upenn.edu
Reply-To: adam@hyper.lap.upenn.edu (Adam Feigin)
Followup-To: adam@hyper.lap.upenn.edu
Organization: University of Pennsylvania, Language Analysis Project
Lines: 43

I've got a DSP90 with an MSD-500 that is exhibiting the following
problem. I'm getting lots of "disk block header errors" at the first
address on the disk. Has anybody out there seen this behavior ?? Is it
a known bug/problem ??? We've had this problem for over a year, and
everything has been replaced, including the MSD-500 itself, but the
problem does not go away. Our local SSE thought that it could be
a grounding problem, but everything checked out okay. The DSP doesn't
crash or anything, but I've got a bad feeling that eventually nasty things
are going to start happening.  An excerpt from the system error log is
included below.

Wednesday, January 13, 1988
   2:12:54 pm (EST)  disk error
      storage module, volx=1, daddr=1: disk block header error (OS/disk manager)
Sunday, January 24, 1988
   12:50:42 pm (EST)  disk error
      storage module, volx=1, daddr=1: disk block header error (OS/disk manager)
Wednesday, February 3, 1988
   2:52:13 pm (EST)  disk error
      storage module, volx=1, daddr=1: disk block header error (OS/disk manager)
   2:54:44 pm (EST)  disk error
      storage module, volx=1, daddr=1: disk block header error (OS/disk manager)
Friday, February 5, 1988
   9:31:36 am (EST)  disk error
      storage module, volx=1, daddr=1: disk block header error (OS/disk manager)
Monday, February 8, 1988
   10:16:45 am (EST)  disk error
      storage module, volx=1, daddr=1: disk block header error (OS/disk manager)

If anybody has a solution to this problem, I'd sure appreciate hearing about 
it !!!!

							Adam

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                                                      Adam Feigin
						   Network Administrator
					         Language Analysis Project
					         University of Pennsylvania
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