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From: davids@iscuva.iscs.com (David Schmidt)
Newsgroups: comp.unix.ultrix
Subject: Re: Problems with dd and large blocks on 2.0 VS II/GPX w/TK50??
Message-ID: <10287@felix.UUCP>
Date: Fri, 23-Oct-87 13:59:49 EST
Article-I.D.: felix.10287
Posted: Fri Oct 23 13:59:49 1987
Date-Received: Mon, 26-Oct-87 00:58:35 EST
References: <9966@felix.UUCP>
Sender: zemon@felix.UUCP
Organization: ISC Systems Corporation, Spokane, WA
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In article <9966@felix.UUCP> jmsellens@watdragon.waterloo.edu (John M. Sellens) writes:
>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:
>
>[...]
>
>John Sellens -- Logic Programming and Artificial Intelligence Group

I had the same problem.  When re-reading the Ultrix 2.0 release notes I
found:

Paragraph 2.2.5.2, page 2-25, binder 3A (System Manager, release notes)
  THE DD COMMAND RESTRICTIONS
Do not specify a blocksize greater than (64K minus 1) bytes when using the
dd command or TMSCP devices may hang.

If you want to read the tape you will have to read it under Ultrix 1.2 and
then re-write it with a blocksize <= 127.  (We had some machines running
both versions so we were able to convert our few tapes with the large block
size)
-- 
David Schmidt              UUCP:  davids@iscuva.ISCS.COM
ISC Systems Corporation           (uunet!iscuva!davids)
East 22425 Appleway        Phone: +1 509 927-5479
Liberty Lake, WA  99019