Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!hellgate.utah.edu!cs.utexas.edu!milano!ncr-sd!ncrlnk!usglnk!pmday_2!steve
From: steve@pmday_2.Dayton.NCR.COM (Steve Bridges)
Newsgroups: ncr.sys.unix,comp.sys.ncr
Subject: Copying from one tape to another tape
Keywords: cpio, tar, dd
Message-ID: <812@pmday_2.Dayton.NCR.COM>
Date: 11 Jan 90 02:43:50 GMT
Reply-To: steve@pmday_2.Dayton.NCR.COM (Steve Bridges)
Distribution: usa
Organization: NCR Corporation - USG Product Marketing (Dayton)
Lines: 31

My co-workers and myself are trying to figure something out.  The situation
is, suppose, I have a tape in cpio format, and want to copy it to another
tape (separate drive) using cpio without putting a temporary copy on disk.

A possible scenario follows:  I have a 150mb tape with some files somebody
with another tower wants.  They only have a 45mb tape drive, but I have
both a 150mb and a 45mb tape drive.  I want to copy what is on
the 150mb tape to a 45mb tape without putting a copy in disk.

So far, I have tried:

cpio -idmuvcB < /dev/rtp | cpio -ocvB > /dev/rtp1

It worked, but put a copy of all the files on disk.

I tried cpio -ocvB < `cpio -idmuvcB < /dev/rtp` > /dev/rtp1
but it didn't work

Would  cpio -idmuvcB < /dev/rtp > cpio -ocvB > /dev/rtp1
do what I want without putting a copy on disk?

Thanks in advance for any responses.




-- 
Steve Bridges                    | NCR - USDPG Product Marketing and Support OLS
Steve.Bridges@Dayton.NCR.COM     | Phone:(513)-445-4182 622-4182 (Voice Plus)
..!ncrlnk!usglnk!pmday_2!steve   | AOPA #916233
..!uunet!ncrlnk!usglnk!pmday_2!steve| PP-ASEL, AMEL