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From: jmsellens@watdragon.waterloo.edu (John M. Sellens)
Newsgroups: comp.unix.ultrix
Subject: Problems with dd and large blocks on 2.0 VS II/GPX w/TK50??
Message-ID: <9966@felix.UUCP>
Date: Tue, 20-Oct-87 15:02:46 EDT
Article-I.D.: felix.9966
Posted: Tue Oct 20 15:02:46 1987
Date-Received: Thu, 22-Oct-87 00:31:59 EDT
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I've been trying to read some TK50 dump tapes I wrote under Ultrix
1.2 with the 4.3 dump using a blocksize of 126.  Under Ultrix 2.0,
it seems that dd has trouble with large block sizes, at least on
my sort of weird system.  It won't read in the dump tape I have
using an input block size of 126k.  After experimenting a while,
it seems that dd may have some problems.  For example:

    % ls -l a
    -rw-r--r--  1 root           1024000 Oct 17 00:41 a
    % mt -f /dev/rmt0h rewind
    % dd obs=100k of=/dev/rmt0h <a
    write: Error 0
    200+0 records in
    0+0 records out
    Exit 255             ./dd obs=100k of=/dev/rmt0h < a
    %

(Lovely error message isn't it?  Doesn't even tell you it's from dd.)
Does this happen to anyone else?  Or have I broken my system?
This is on a VAXstation II/GPX with a TK50.

John Sellens -- Logic Programming and Artificial Intelligence Group

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