Tape Copy Problems

From: Dave Hinkle <dhinkle_at_dynatec.com>
Date: Fri, 26 May 1995 14:08:02 PST

Great list, my turn to use it!

I have a 3000/400 running DEC Unix v3.2 with a EXAbyte 8505 and 8200
(5GB and 2GB) tape drives attached. I have a 5GB tape that I want
to make a copy of (rumored to have about 3GB of data on it in one
file). Anyway, I used the cksum command to get the length of the
tape(file), and it returned a length of about 900MB. OK, I say, I
can use the command cat </dev/rmt0h >/dev/rmt1h to make a copy from
the 5GB to the 2GB, and everything works, cksum </dev/rmt1h reports
the same CRC and file size on the 2GB copied tape.

Now for the wierd part. The tcopy /dev/rmt0h (5GB tape) command
tells me that there is 3GB of data on the tape! Whats going on? Can
I use the cat command to copy tapes like this?

Thanks,

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Dave Hinkle
Mgr. Computer Services Group email: dhinkle_at_dynatec.com
Dynamics Technology Inc. voice: (310)543-5433
21311 Hawthorne Blvd Suite 300 fax : (310)543-2117
Torrance, CA 90503-5610
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Received on Fri May 26 1995 - 17:09:11 NZST

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