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Operating Systems SCO CPIO listing from tape question... Post 302645539 by methyl on Wednesday 23rd of May 2012 04:34:54 PM
Old 05-23-2012
Please post the script which was used to create the tape.

We are particularly interested in whether the "no rewind" device was used on output in which case you would need to use the unix mt command to advance partition-by-partition along the tape. Also whether the block size parameters and/or ASCII headers options were used because the same parameters are required on data retrieval.

I think that we can safely say that the first tape partition is empty, or contains something not recognisable as a unix filesystem, or was written with special parameters.
BTW. In those days we used to pipe cpio to dd to get some speed and this created a raw tape partition.

Tip: If you have a blank tape available, practice the commands on a blank tape and keep an eye on the device directory to make sure that you actually write to the tape drive and not to a file. Try some basic mt commands to make sure that the tape moves.

Footnote: By old you mean really old (i386 !). What is the hardware? I wouldn't risk loading any critical data tapes until you are 100% sure of the commands because you may only have one go at this.

Last edited by methyl; 05-23-2012 at 05:48 PM..
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dds-dd(1)						      General Commands Manual							 dds-dd(1)

NAME
dds-dd - tool to read a dds device. SYNOPSIS
dds-dd [ -f device ] DESCRIPTION
dds-dd reads a dds tape devices (DAT). Every block is read and written to stdout. A tape with unknown block size or blocks of different size can be read. The default device is /dev/rmt0, which may be overridden with the environment variable TAPE, which in turn may be overridden with the -f device option. The device must be a character special file. OPTIONS
-f device Device of the tape archive (default is /dev/rmt0). Must be a character special file connected to a dds tape device. -V,--version Print the version number of mt-dds to stderr and exit immediately. --help print some screens of online help with examples through a pager and exit immediately. EXAMPLES
Example: Read the tape and make a listing: dds-dd | tar ft - Example: Read the tape and make a listing: dds-dd | cpio -it ENVIRONMENT
The environment variable TAPE overrides the default tape device /dev/rmt0. SEE ALSO dds2tar(1), dds2index(1), mt(1), tar(1) HISTORY
This program was created to use it in conjunction with dds2tar. AUTHOR
J"org Weule (weule@cs.uni-duesseldorf.de), Phone +49 211 751409. This software is available at ftp.uni-duesseldorf.de:/pub/unix/apollo 2.4 dds-dd(1)
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