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Full Discussion: multi tape option in tar cmd
Operating Systems Linux Red Hat multi tape option in tar cmd Post 302566424 by Corona688 on Thursday 20th of October 2011 10:33:30 AM
Old 10-20-2011
If your version of tar can read from stdin, you can do something like this to avoid storing hundreds upon hundreds of gigabytes of temporary files:

Code:
# create tapes
mkfifo tarfifo
tar -vcf tarfifo /path/to/files &
PID=$!
N=0
while [ -d /proc/${PID} ]
do
        printf "Insert tape and hit enter " >&2
        read < /dev/tty # Read from terminal, not tarfifo
        dd of=/dev/tape bs=<tape_blocksize> count=<tape_blocks>
        eject_tape
        N=`expr $N + 1`
done <tarfifo

Code:
# extract tapes
mkfifo tarfifo
N=0
while [ -z "$INPUT" ]
do
        dd if=/dev/tape bs=<tape_blocksize> count=<tape_blocks>

        eject_tape

        # Print to stderr, so we don't feed this message into tar!
        printf "Insert tape and hit enter " >&2
        read INPUT
        N=`expr $N + 1`
done | tar -C /path/to/dest/ -xvf -

You could test this with local files instead of tapes by replacing /dev/tape with /path/to/file$N and using a small blocksize and blockcount.
Last edited by Corona688; 10-20-2011 at 11:40 AM..
This User Gave Thanks to Corona688 For This Post:
nithyanandan
 

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LEARN ABOUT OPENSOLARIS

dda

dda(7D) 							      Devices								   dda(7D)

NAME

       dda - MMS disk archiving driver

SYNOPSIS

       /devices/pseudo/dda@lun:bn

DESCRIPTION

       The  Media Management System (MMS) is a distributed removable media management system based on the IEEE 1244 Media Management System speci-
       fication. MMS provides a uniform and consistent tape interface to client applications.

       The dda driver is a pseudo tape drive with filesystem file media. The dda driver is a minimal emulation of the st(7D) tape driver  mtio(7I)
       interface  with	BSD no-rewind behavior and is used for MMS disk archiving. The dda driver should be used with a MMS MMP mount command han-
       dle. You configure DDA tapes, drives, and libraries for disk archiving using the mmsadm(1M) command. You also use mmsadm(1M) to	mount  and
       unmount dda media.

CONFIGURATION

       To  set	the  number  of disk archiving tape drives available for MMS disk archiving, edit the /kernel/drv/dda.conf configuration file. The
       default number of disk archiving tape drives is 20.

       The disk archiving tape drive devlinks are located in the /dev/dda directory.

       The DDA maximum block size is 262144 bytes and the minimum is 1 byte.

FILES

       /kernel/drv/dda		  32-bit kernel module (x86)

       /kernel/drv/sparcv9/dda	  64-bit kernel module (SPARC)

       /kernel/drv/amd64/dda	  64-bit kernel module (x86)

       /kernel/drv/dda.conf	  dda configuration file

ATTRIBUTES

       See attributes(5) for a description of the following attributes:

       +--------------------+---------------------------------------------------------+
       |  ATTRIBUTE TYPE    |			  ATTRIBUTE VALUE		      |
       +--------------------+---------------------------------------------------------+
       |Architecture	    | SPARC, x86					      |
       +--------------------+---------------------------------------------------------+
       |Availability	    | SUNWmmsr						      |
       +--------------------+---------------------------------------------------------+
       |Interface Stability | Uncommitted					      |
       +--------------------+---------------------------------------------------------+

SEE ALSO

       mt(1), mmsadm(1M), attributes(5), dmd(7D), st(7D), mtio(7I)

       IEEE 1244 Removable Media Standards Specification -- IEEE, 2000

SunOS 5.11							    17 Oct 2008 							   dda(7D)
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