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From: mitch@rock.sgi.com (Thomas P. Mitchell)
Newsgroups: comp.sys.sgi
Subject: Re:  IRIS 3030 Disk Problems
Message-ID: <408@odin.SGI.COM>
Date: 24 Aug 89 00:08:14 GMT
References: <8908221403.AA27953@lerc08.lerc.nasa.gov>
Sender: news@odin.SGI.COM
Organization: Silicon Graphics Computer Systems,  Mountain View CA.
Lines: 21

In article <8908221403.AA27953@lerc08.lerc.nasa.gov> fsfacca@LERC08.LERC.NASA.GOV (Tony Facca) writes:
>"Brent L. Bates AAD/TAB MS294 x42854" <blbates@aero4.larc.nasa.gov> writes:
>
>>   If the disk is completely dead

Don't forget to check DC power.  Bad DC power can make 
anything look bad.  Look at things before they go bad.

Remember that there is a 'sender' and a 'receiver' in the
system.  In fact there are layers of talking and
listening.  Clearly the CPU must talk to the controller the
contoler to its device etc.  Then there must be a return
path.  It is often impossible to decide if it is the sender
or the listener that is having a problem.   This makes
'known' good parts very valuable as a diagnostic tool. 



 
Thomas P. Mitchell (ARPA:mitch@csd.sgi.com, UUCP:  {decwrl,ucbvax}!sgi!mitch )
Rainbows -- The best (well second best) reason for windows.