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From: moore@ucbcad.UUCP
Newsgroups: comp.unix.questions,comp.unix.wizards
Subject: Re: "tar  | dd " question
Message-ID: <1677@ucbcad.berkeley.edu>
Date: Sun, 14-Jun-87 01:25:59 EDT
Article-I.D.: ucbcad.1677
Posted: Sun Jun 14 01:25:59 1987
Date-Received: Sun, 14-Jun-87 22:01:24 EDT
References: <13658@teknowledge-vaxc.ARPA>
Reply-To: moore@cad.Berkeley.EDU.UUCP (Peter X Moore)
Organization: UC Berkeley, CAD group
Lines: 16
Xref: utgpu comp.unix.questions:2478 comp.unix.wizards:2490

Instead of
	tar cBf - . | rsh remote dd of=/dev/rmt12 bs=20b

use 
	tar cBf - . | rsh remote dd of=/dev/rmt12 obs=20b 

setting bs causes no reblocking to be done, the blocks written are the same 
size as the blocks read.  Unfortunately, your ethernet is fracturing your 
blocks, so your tape is getting fractured blocks as well.  Setting obs=20b
guarantees the tape blocks are all precisely 20b long.  You might want to set
ibs=20b as well, the default is 1b and probably (maybe?) inefficient.


	Peter Moore
	moore@ic.Berkeley.edu
	...!ucbvax!moore