SUMMARY: tape to tape duplication

From: Laura Park (
Date: Fri May 15 1998 - 10:04:23 CDT

     Thanks for the many responses! There were too many names to list!!!
     Commands summarized below followed by original message.
     tcopy (if drives on same system; may not work with all tape formats)
     tcopy source [ destination ]
        tcopy /dev/rst0 /dev/rst1
        tcopy /dev/rmt/xxx /dev/rmt/yyy
     Drives on Same System
     dd if=/dev/<tape drive 1 address> of=/dev/<tape drive 2 address>
        dd if=/dev/rmt/0m ibs=126b | dd of=/dev/rmt/1m obs=126b
     Drives on Different Systems
     dd if=/dev/rmt/0m ibs=126b | rsh tapehost -n dd \ of=/dev/rmt/1m
        dd if=/dev/rmt/0m bs=10240 | remsh host2 'cat | dd of=/dev/rmt/0m \
     Blocking size comments:
        "The idea is to use a blocksize which streams well, in other words
     both tapes running continuously, without constant stopping and
     Reminder to check validity of tape copied with:
        mt -f /dev/rmt/1 rewind
        tar tvf /dev/rmt/1n
     ** Other suggestions (which I did not try yet) are:
        cp -r (if you're going from one Solaris 8mm to another of the
     same size on the same system)
     tar xf $TAPE1 - | tar cf $TAPE2 - (for tar tapes)
     At 02:08 PM 5/13/98 GMT, you wrote:
> We are trying to copy the contents of one 8mm tar tape
> directly to another 8mm tape without going to disk in between.

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