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Full Discussion: AIX & TAR related stuff
Operating Systems AIX AIX & TAR related stuff Post 302772197 by bakunin on Sunday 24th of February 2013 09:10:17 AM
Old 02-24-2013
Quote:
Originally Posted by MichaelFelt
but it used to be if you restored a file using tar all the zero bytes that are not on disk actually get written to the "tape" AND these zero bytes get restored. (so called sparse files getting backed up and restored as "full" files.
This is true. From the AIX 6.1 manual:

Quote:
tar does not preserve the sparse nature of any file that is sparsely allocated. Any file that was originally sparse before the restoration will have all space allocated within the filesystem for the size of the file.
IMHO "tar" is a good device to bundle some files up to an archive. If one wants to bundle the source files for a software project or to create a snapshot of ones HOME-directory it is a tool worth considering. "tar" plays in the same league as "cpio", "pax" and probably some other tools, "backup" among them.

As Michael hinted at "tar" is platform-independent to a quite unparalleled degree. This is as much an advantage as it is a limiting factor because of some limitations. And for system-wide backups i would use "mksysb" and "savevg" solely under AIX - neither "tar" nor any of the other aforementioned programs.

Just my 2 cents.

bakunin
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BF_TAR(1)						    Bogofilter Reference Manual 						 BF_TAR(1)

NAME
bf_tar - shell script to write a tar file of a bogofilter directory to stdout SYNOPSIS
bf_tar [-r] [-R] bogofilter_directory DESCRIPTION
bf_tar bundles a bogofilter working directory in tar format and copies it to standard output (your console, or where you redirect it, see EXAMPLES below). OPTIONS
The -r option causes bf_tar to remove inactive log files after the archive has been written successfully. The default is to leave log files. The -R option causes bf_tar to remove inactive log files before the archive is written. This may reduce chances that the resulting archive is recoverable should it become damaged. The archive may be smaller though. The default is to leave log files. EXIT STATUS
The script exits with status code 0 if everything went well, and nonzero if it encountered trouble. EXAMPLES
o bf_tar ~/.bogofilter > outfile.tar Writes a standard .tar file containing the essential files from ~/.bogofilter to outfile.tar. o bf_tar ~/.bogofilter | gzip -9 -c > outfile.tar.gz Writes a gzipped .tar.gz file containing the essential files from ~/.bogofilter to outfile.tar.gz. o bf_tar `pwd`/mydirectory > outfile.tar Prepend $(pwd)/ or `pwd`/ if you want to specify an absolute path instead of a relative path. NOTES
This script is meant for use with Berkeley DB based bogofilter versions. This script requires a SUSv2 compliant pax utility. This script expects a SUSv2 compliant shell. Solaris systems should have the SUNWxcu4 package installed (when bogofilter is configured) so that /usr/xpg4/bin/sh can be used. AUTHORS
Matthias Andree Bogofilter 10/22/2012 BF_TAR(1)
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