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From: burati@ULOWELL.CSNET (Michael Burati)
Newsgroups: mod.computers.apollo
Subject: File corruption.
Message-ID: <8602110108.AA28362@Yale-Bulldog.YALE.ARPA>
Date: Mon, 10-Feb-86 11:16:00 EST
Article-I.D.: Yale-Bul.8602110108.AA28362
Posted: Mon Feb 10 11:16:00 1986
Date-Received: Wed, 12-Feb-86 01:54:03 EST
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The ARPA Internet
Lines: 34
Approved: apollo@yale-comix.arpa


We have been having a small problem lately with files becoming corrupt
periodically for no visible reason.  The first couple of times it happened,
I assumed that it might be due to a couple of network crashes (coax problem)
that coincidentally happened while the files were being transferred.

	This is the problem;
A file on a DFS500 could not be edited from another node.  After about a minute
of hanging, every time we tried to access the file with the AEGIS editor,
the error "Remote node failed to respond to request" appeared.  The file still
showed up in the directory listing, but sometimes it would return with
attributes unavailable (using $ ld -a) (note: all the other files in the
directory were accessible).  Using "catf", the file would print about halfway
through, then hang for a minute, and return with "Remote node failed ...".
Using the "vi" editor, I finally managed to read in the file, advance to
the end of file, then write the file back out. This appeared to solve the
problem, but when we tried to compile the file, we realized that about 50 lines
were then missing from the middle of the file.  What's happening ??


Any insight to this problem, with possible solutions would be appreciated.
Note that this happened several times, over the last few months, on
different nodes. (Also note that the network hasn't hung since the first
occurence that I mentioned).

Thanks in advance.

Mike Burati
University of Lowell
Comp Sci Dept
Lowell MA

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CSNET: burati@ulowell