Very Computer

Can some kind person please help us ?  We have a series of 8mm tapes with
some important data on.  One of our machines has an 8mm exabyte drive attached
and another has a 4mm DAT tape attached.  We want to copy the data directly
to the DAT tapes for storage.

Can anyone suggest a simple series of commands to extract data from the 8mm
tapes and pipe this output across the ethernet directly to the 4mm tape ?

Many thanks

Bill Lyons

--
Applied Climate Research Unit, University of Queensland
Brisbane        QLD     4072    Australia.
Ph (07) 365 3565 [Int'l 617 3653565] Fax: (07) 3653561 [Int'l: 617 3653561]

Quote:> Hi there !
> Can some kind person please help us ?  We have a series of 8mm tapes with
> some important data on.  One of our machines has an 8mm exabyte drive attached
> and another has a 4mm DAT tape attached.  We want to copy the data directly
> to the DAT tapes for storage.
> Can anyone suggest a simple series of commands to extract data from the 8mm
> tapes and pipe this output across the ethernet directly to the 4mm tape ?

fourmm  : name of machine with DAT
eightmm : name of machine with Exabyte (or whatever 8mm tape driver)

From machine with tape drive first ensure that you have ".rhosts" set for remote execution with no password :-

fourmm% rsh eightmm ls

This should show a directory listing not give the error message "Permission Denied".

then to transfer :-

fourmm% dd if=/dev/rmt/0 ibs=8K | compress | rsh eightmm "uncompress | dd of=/dev/rmt/0 obs=8K"

The compress ... uncompress are not necessary but will give a performance increase, particularly on a busy net.

Host:b
User:root
Drive 4mm, /dev/rmt/0

create an .rhosts file containing the line:
a

in / dir on b.

on a issue the command

dd if=/dev/rmt/0 | rsh b dd of=/dev/rmt/0

This should work, check the man pages for dd as you
may want to set block sizes etc...
This may not work if machines are different types,
e,g, SunOS & Solaris, I;m always getting my
SunOS/Solaris tars/cpios/dd in a muddle,

Pete

: Hi there !

: Can some kind person please help us ?  We have a series of 8mm tapes with
: some important data on.  One of our machines has an 8mm exabyte drive attached
: and another has a 4mm DAT tape attached.  We want to copy the data directly
: to the DAT tapes for storage.

: Can anyone suggest a simple series of commands to extract data from the 8mm
: tapes and pipe this output across the ethernet directly to the 4mm tape ?

: Many thanks

: Bill Lyons

:  

: --
: Applied Climate Research Unit, University of Queensland
: Brisbane      QLD     4072    Australia.
: Ph (07) 365 3565 [Int'l 617 3653565] Fax: (07) 3653561 [Int'l: 617 3653561]

--
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Tel: +44 (0)483 740770  Fax   : +44 (0)483 771998
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No no no...  Using dd requires choosing a block size, which may or
may not match how the tape was written.  Some drives (QIC) don't
care, so long as the block size is a multiple of 512 bytes.  Some
do, like 1/2" drives.  I'm not sure about 4mm, but I believe some
8mm drives do care.

The best way to do this is to use tapecv, which was posted recently.
It was designed to do exactly this.
--

        David L. Markowitz
        Solaris Systems Division - Genisco Technology Corporation