Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sdd.hp.com!apollo!vinoski
From: vinoski@apollo.HP.COM (Stephen Vinoski)
Newsgroups: comp.sys.apollo
Subject: Re: Why is my sau10 so big?
Keywords: Stand Alone Utilities
Message-ID: <4e9cfe2c.20b6d@apollo.HP.COM>
Date: 15 Dec 90 16:13:00 GMT
References: <3067@naucse.cse.nau.edu>
Sender: root@apollo.HP.COM
Reply-To: vinoski@apollo.HP.COM (Stephen Vinoski)
Organization: Hewlett-Packard Company, Apollo Division; Chelmsford, MA
Lines: 53


In article <3067@naucse.cse.nau.edu> jdc@naucse.cse.nau.edu (John Campbell) writes:
>Actually, I'm posting to help a friend.  On the 4500 machines that
>I help manage the sau7 directory is a reasonable size.  On my
>friends DN10000 the sau10 directory looks overly bloated.  What's
>the scoop (//carbon is the DN10000 machine):
>
># du //carbon/sau10
>8	//carbon/sau10/cmd
>84	//carbon/sau10/help
>25204	//carbon/sau10/scan/cpu
>43060	//carbon/sau10/scan/graphics
>21156	//carbon/sau10/scan/memory
>564	//carbon/sau10/scan/utility
>90020	//carbon/sau10/scan
>95976	//carbon/sau10

As you can see most of the space is being taken up by the /sau10/scan
directory.  That directory mostly contains databases used by the
offline SCATMAN (which stands for "SCAn Test MANager") utility for
testing the various XBUS boards.  The databases are compressed, to
some extent.  Unfortunately, SCATMAN has only 36k of service processor
RAM to operate within, and it must work through all these databases in
order to fully test the machine, so there was no space available for a
fancy decompression algorithm.

For what it's worth, the SCATMAN diagnostics achieve a fault coverage
well above 90% for each of the XBUS boards, in a run time of only 20
minutes or less per board.  From a testability and diagnosis point of
view, the complexity of each board is staggering.  Traditional DEX
diagnostics would have had run times of hours and would still have not
even approached this high level of fault coverage.  Simply put, we
traded disk space for the ability to ensure the correctness of the
XBUS boards.  If you've had trouble with an XBUS board that the
diagnostics didn't catch, I'd like to hear about it.

If your DN10000 does not have the XBUS graphics board, and you never
plan to get one, you can delete the /sau10/scan/graphics directory.
If you have several DN10000s on the same ring, I suppose you could
delete the /sau10/scan directory from all but one of them, then boot
diskless off the one if it ever becomes necessary to run SCATMAN
diagnostics.

Hope this explanation helps.  If you have any further questions about
this, feel free to send me email.


-steve

 
| Steve Vinoski  (508)256-6600 x5904       | Internet: vinoski@apollo.hp.com  |
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