Very slow Tar extraction from tape

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LEARN ABOUT DEBIAN

dds2index

dds2index(1)						      General Commands Manual						      dds2index(1)

NAME

       dds2index - tool to create an indexfile for the use of

SYNOPSIS

       dds2index [options]

DESCRIPTION

       dds2index  creates  an  index file that is required by the file extraction utility dds2tar(1).  It works on tar archives stored on dds tape
       devices (DAT).  Since the file structure of the tape archives is used to extract the files, the archive must be	an  uncompressed  tar  ar-
       chive. But compression by the transparent signal processor of the tape device is allowed.

       The  index  created  by	dds2index is written to stdout by default and should normally be stored on hard disk as indexfile for later use by
       dds2tar(1).

       The default tape device to read from is /dev/nst0, which may be overridden with the environment variable TAPE, which in turn may  be  over-
       ridden with the -f device option. The device must be a SCSI tape device.

OPTIONS

       -f devicefile
	      device of the tape archive. Must be a character special file.

       -t indexfile
	      write the index to indexfile, not to stdout.

       -z,--compress
	      write the index in (gzip) compressed mode.

       --help print some screens of online help with examples through a pager and exit immediatley.

OPTIONS you didn't really need
       -b, --block-size
	      Set the maximal blocksize, dds2index can handle.

       --z, --no-compress
	      Don't filter the archive file through gzip.

       -v,--verbose
	      verbose mode. Print to stderr what is going on.

       -h,--hash-mode
	      Print a hash sign '#' to stderr for each MB read from tape.

       -V,--version
	      Print the version number of dds2index to stderr and exit immediately.

EXAMPLES

       Example of getting the index from the default tape /dev/nst0 and storing it in file archive.idx:

	      dds2index -v -t archive.idx

WARNING

       This  program  can  only read records (tar is calling them tape blocks) up to 32 kbytes. A bigger buffer will cause problems with the Linux
       device driver.

ENVIRONMENT

       The environment variable TAPE overrides the default tape device /dev/nst0.

FILES

       /dev/nst0     default tape device file. Must be a character special file.

SEE ALSO

       dds2tar(1), mt(1), mt-dds(1), tar(1), gzip(1)

HISTORY

       This program was created as a tool for dds2tar(1).

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							      dds2index(1)

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