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From: guy@gorodish.Sun.COM (Guy Harris)
Newsgroups: comp.unix.questions,comp.unix.wizards
Subject: Re: File Transfer SYSV.0 --> BSD4.1 :-(
Message-ID: <39603@sun.uucp>
Date: 21 Jan 88 19:37:51 GMT
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Keywords: 300 Mb to move

> Does anyone know of any tape utilities that are preferably multi-volume AND
> compatible between the two flavors of Unix ?

The only tape utilities that I know of that come with 4.1BSD are "tar" and
"dump"/"restor".  "tar" also comes with S5 (unless your vendor did something
stupid such as deleting it), and the two are compatible (being based on the
same code).  4BSD "tar" can read tapes made by other "tar"s, and other "tar"s
can read tapes made by the 4BSD "tar" with only some warnings issued when the
entries the 4BSD "tar" puts onto the tape for directories are encountered.
(Everything *works* correctly, you just get noise.)  The "o" option to the 4BSD
"tar" will tell it not to put those entries on the tape.

Neither of the versions of "tar" in question support multiple volumes.  If you
want multi-volume support, you'll have to port "cpio" to the 4.1BSD system
(doable - it won't just compile as is, but somebody fairly knowledgable about
UNIX can fix it) or port some other utility that supports multiple volumes to
both systems.

"dump"/"restor" supports multiple volumes, but "dump" only dumps entire file
systems; while the S5 and 4.1BSD file systems are basically the same (i.e., the
V7 file system), there may be some minor tweaks involved in porting it to S5.
Also, note that "dump" writes binary data directly to the tape, so "dump" tapes
can't necessarily be read by a vanilla "restor" on a machine with different
data formats (byte order, alignment rules, etc.).
	Guy Harris
	{ihnp4, decvax, seismo, decwrl, ...}!sun!guy
	guy@sun.com