Piping to /dev/rmt0 tape ? Post: 302323682

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Operating Systems AIX Piping to /dev/rmt0 tape ? Post 302323682 by shockneck on Monday 8th of June 2009 05:41:38 PM

06-08-2009

Registered User

Quote:

Originally Posted by Browser_ice

[...]What I am trying to achieve is backing up to tape any folders containing backup files, using compression, not using the current folder as temporary storage (no space for it).

Using pipes you don't need temporary diskspace and tar does not care whether it writes an archive onto disk or onto /dev/rmtX directly. This is all files to Unix. Try to use a combination of commands, pipes and files to backup compressed data onto a tape. Sth. like

Code:

# tar -cBf - /yourdirectory | compress | dd of=/dev/rmt0

B option (blocking) is recommended with pipes. Reverse the syntax to read data from tape again.

Code:

# dd if=/dev/rmt0 | uncompress | tar -xBf -

Quote:

Originally Posted by Browser_ice

All this on an AIX 4.2 who's TAR does not have any compression on it and where I only have 'compress' as compression tool (althougth I said we had gzip, it is not on all our server and I am almost on a deadlock situation when talking to my team lead about copying it to all our servers because he says the license is only on one server !!!)

gzip is open source. What did you mean with "the license is only on one server"? Smilie

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LEARN ABOUT DEBIAN

dds-dd

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)