Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cs.utexas.edu!wuarchive!mit-eddie!apollo!vinoski
From: vinoski@apollo.HP.COM (Stephen Vinoski)
Newsgroups: comp.sys.apollo
Subject: Re: Why is Domain OS so big?
Keywords: diskspace, Domain, huge
Message-ID: <4754401e.20b6d@apollo.HP.COM>
Date: 9 Dec 89 21:21:00 GMT
References: <6627@tank.uchicago.edu>
Sender: root@apollo.HP.COM
Reply-To: vinoski@zep.UUCP (Stephen Vinoski)
Organization: Apollo Computer, Chelmsford, MA
Lines: 45

In article <6627@tank.uchicago.edu> rtp1@tank.uchicago.edu (raymond thomas pierrehumbert) writes:
>                         Does anybody have any bright ideas as to
>what I could delete to free up significant amounts of space?  What
>is all that stuff in the sau10 directory for?  Is all of it really ]
>needed?  

Most of the files in the /sau10 directory and subdirectories have to do with
diagnostics.  Apollo machines usually only have diagnostics which run under
the Diagnostic EXecutive (DEX), but due to the enormous complexity of testing a
machine like the DN10000, we chose to use scan testing techniques to provide
high fault coverage and good fault isolation.  Scan tests execute quickly, but
require large amounts of input data and expected output data.  Most of the files
in the /sau10/scan directory are scan test data files which are used by the scan
diagnostic executive (called the SCAn Test MANager, or SCATMAN) to test the
machine. These data files are highly compressed but some of them are still
pretty large.

One good way to free up some disk space on a DN10000 which does not have 
Visualization System graphics (an X-Bus graphics board) installed would be to
delete the /sau10/scan/graphics directory - that will give you ~10 megabytes
back.  HOWEVER, I strongly suggest that you avoid deleting any of the OTHER
/sau10/scan subdirectories

         /sau10/scan/cpu
         /sau10/scan/memory
         /sau10/scan/utility

if your DN10000 is a stand-alone system; without them, SCATMAN will be unable to
test and diagnose the machine.  Note that the DEX diagnostics were designed to
be run only after the SCATMAN tests pass, since those diagnostics require
hardware which is verified by SCATMAN.  If you have multiple DN10000's on a
network, only one of them really needs to have the SCATMAN and DEX diagnostics
installed, and the rest can be tested by booting the diagnostics from the disk
on that node.

Of course, as soon as you purchase and install the X-Bus graphics board, you
will have to reinstall that /sau10/scan/graphics directory...      ;-)

Hope this helps.


-steve
| Steve Vinoski       | Hewlett-Packard Apollo Div. | ARPA: vinoski@apollo.com |
| (508)256-6600 x5904 | Chelmsford, MA    01824     | UUCP: ...!apollo!vinoski |
| "My second wife isn't even born yet."                                        |