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From: dudek@endor.harvard.edu (Glen Dudek)
Newsgroups: comp.bugs.4bsd
Subject: Re: tmscp tape drives give "hard error" on reading too small a record
Message-ID: <1700@husc6.UUCP>
Date: Mon, 20-Apr-87 16:40:40 EST
Article-I.D.: husc6.1700
Posted: Mon Apr 20 16:40:40 1987
Date-Received: Tue, 21-Apr-87 03:20:43 EST
References: <1681@husc6.UUCP> <2412@ulysses.homer.nj.att.com> <1696@husc6.UUCP> <17000@sun.uucp>
Sender: news@husc6.UUCP
Reply-To: dudek@harvard.harvard.edu (Glen Dudek)
Organization: Aiken Computation Lab Harvard, Cambridge, MA
Lines: 16
Keywords: tmscp, TU81, DEC

Without having the actual tape drives and testing it, I cannot be sure,
but it appears to me that all other 4.3BSD tape drivers behave the same, that
is, all record size errors are ignored when reading from the raw tape device.

/dev/rmt4 and /dev/nrmt4 are two names for the same (no rewind) minor device,
at least on 4.3BSD and Ultrix 1.2.

In fact, the documentation (mtio(4)) states that an error is returned when
a blocksize is found which is larger than the buffer size passed to the read.
Oh well... DEC and the documentation are right, and I and the other tape drivers
are wrong.  Sorry.

It *is* interesting to note that the installation in question was a SUN
software installation...

	Glen