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Full Discussion: Copy huge files system
Operating Systems AIX Copy huge files system Post 302510905 by bakunin on Tuesday 5th of April 2011 09:48:42 AM
Old 04-05-2011
Quote:
Originally Posted by Mr.AIX
But the number of the files is very huge .. Are you sure this is will success ?
Yes, this will work, regardless of the number of files.

You could use "dd" too, but i would prefer to use an "high-level" approach when possible instead of a "low-level" approach such as "dd". With "dd" it is easily possible to overwrite not only files, but devices, volume group information, things quite vital to your system.

With "tar" you deal with files, directories and the like - things which are easily recognized by you. With "dd" you ultimately deal with devices, which is much more dangerous. If you mistype "/tgtpaath" in the above mentioned "tar" command you will run into a "disk full"-error, have the chance to correct it and start over. If you confuse hdisk127 and hdisk126 in a dd command it will work well but probably destroy data you didn't want to lose.

That doesn't mean at all that "dd" is a bad tool - it is very powerful, but the power comes at the price of being dangerous too. Use it when you need it, not when it is possible, is my principle. Maybe i'm feeble, but i have been working as a Sysadmin for a long time and i am still alive. ;-))

I hope this helps.

bakunin
 

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SHTOOL-TARBALL.TMP(1)					      GNU Portable Shell Tool					     SHTOOL-TARBALL.TMP(1)

NAME
shtool-tarball - GNU shtool command for rolling standardized tarballs SYNOPSIS
shtool tarball [-t|--trace] [-v|--verbose] [-o|--output tarball] [-c|--compress prog] [-d|--directory directory] [-u|--user user] [-g|--group group] [-e|--exclude pattern] path [path ...] DESCRIPTION
This command is for rolling input files under path into a distribution tarballs which can be extracted by tar(1). The four important aspects of good open source software tarballs are: (1) unpack into a single top-level directory, (2) top-level directory corresponds to the tarball filename, (3) tarball files should be sorted and (4) arbitrary names for file owner and group. OPTIONS
The following command line options are available. -v, --verbose Display some processing information. -t, --trace Enable the output of the essential shell commands which are executed. -o, --output tarball Output tarball to file tarball. -c, --compress prog Pipe resulting tarball through compression program prog. -d, --directory directory Sets the top-level directory into which the tarball unpacks. By default it is tarball without the trailing ".tar.*" extension. -u, --user user The user (owner) of files and directories in the tarball to user. -g, --group group The group of files and directories in the tarball to group. -e, --exclude pattern Exclude files and directories matching comma-separated list of regex pattern from the tarball. Directories are expanded before the filtering takes place. The default filter pattern is ""CVS,\.cvsignore,\.svn,\.[oa]$"". EXAMPLE
# Makefile.in dist: ... V=`shtool version -d short ...`; shtool tarball -o foobar-$$V.tar.gz -c 'gzip -9' -u bar -g gnu -e 'CVS,.cvsignore' . HISTORY
The GNU shtool tarball command was originally written by Ralf S. Engelschall <rse@engelschall.com> in 1999 for GNU shtool. SEE ALSO
shtool(1), tar(1), compress(1). 18-Jul-2008 shtool 2.0.8 SHTOOL-TARBALL.TMP(1)
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