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From: farhad@Tehran.Stanford.EDU (Farhad Shakeri)
Newsgroups: comp.unix.ultrix
Subject: First swap less that memory (slightly) Ultrix 3.1C
Message-ID: <1990Apr9.183344.28958@Neon.Stanford.EDU>
Date: 9 Apr 90 18:33:44 GMT
Sender: news@Neon.Stanford.EDU (USENET News System)
Reply-To: farhad@Tehran.Stanford.EDU (Farhad Shakeri)
Organization: Computer Science Department, Stanford University
Lines: 25

I have questions about how the disk driver handles the Memory dump
after the crash, if Memory is slightly greater that the
first chunk (ra0b) of swap.

Our system is a 64MEG (67.07 MB total on boot time) and I use to have
two 65MEG chunks for swaping. We upgraded from 32MEG to 64MEG and
we forgot to make first swap bigger (I know we goofed).

Anyway we had two  major crashes Due to Bad CPU, Bad Memory and
Bad Controller. On each case the memory dump destroyed the next
partition (/usr and /var two cases here).

The problem is fixed now.  I made swap 0 bigger than the total memory.

Is this a bug?  Shouldn't the driver stop the memory dump to prevent
this kind of destruction?  I did not get any satisfactory answers
from DEC.  Does Ultrix 4.0 or 3.1D prevent this?

Thanks is advance.

       +----------------------------------------------------+
      /   Farhad Shakeri       E-Mail:                     /
     /  Stanford University    farhad@Tehran.Stanford.EDU /
    / Computer Science Dept.                             /
   +----------------------------------------------------+