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TAR File Size Limitation

The tar utility which get installed by default on AIX does not have the possibility to tar/untar files larger than 1 GB. To overcome this install the tar utility that is available on the AIX Toolbox for Linux Applications CD-ROM. I've used tar version 1.14-2 with success.

Simple TAR usage

Create TAR

tar -cvf /scratch/myfile_20030617.tar /scratch/mydir/results/stat/*

Extract Files From TAR

tar -xf myfile_20030617.tar 
  • -c = create
  • -f = read to/from the named file (instead of the device /tape)
  • -t = list contents of .tar file
  • -r = append to a .tar file
  • -v = verbose (tells you everything its doing)
  • -x = extract contents of .tar file
  • -z = compress files (not so useful for minc files)

Use Tar to copy files between servers

To copy a large amount of files to another server you can use tar:

  1. Make sure root is allowed to logon to the new server through ssh
  2. Tar the data and pipe it through ssh to the new server
  3. Check the data sizes and number of files and directories

Root login

Edit the /etc/ssh/sshd_config file on the new server:

PermitRootLogin yes
#AllowGroups ssh-access

and restart the ssh service:

sudo /etc/rc.d/rc2.d/Ssshd stop
sudo /etc/rc.d/rc2.d/Ssshd start


bash-3.2# tar clf - /opt/IBM/WebSphere | ssh "tar xf - -C /opt/IBM/WebSphere"

root@'s password:
tar: file -C: not present in archive

Tar options explanation:

            Writes an error message to standard output for each file with a link count greater than 1 whose
            corresponding links were not also archived. For example, if file1 and file2 are hard-linked together and
            only file1 is placed on the archive, then the -l flag will issue an error message. Error messages are not
            displayed if the -l flag is not specified.

-C Directory
            Causes the tar command to perform a chdir subroutine to the directory specified by the Directory variable.
            Using the -C flag allows multiple directories not related by a close common parent to be archived, using
            short relative path names. For example, to archive files from the /usr/include and /etc directories, you
            might use the following command: tar c -C /usr/include File1 File2 -C /etc File3 File4


Old server:

bash-3.2# du -sm /opt/IBM/WebSphere/
1490.79 /opt/IBM/WebSphere/
bash-3.2# find /opt/IBM/WebSphere/ -type f |wc -l
bash-3.2# find /opt/IBM/WebSphere/ -type d |wc -l

New server:

/opt/IBM>sudo du -sm /opt/IBM/WebSphere/
1490.66 /opt/IBM/WebSphere/
/opt/IBM>sudo find /opt/IBM/WebSphere/ -type f |wc -l
/opt/IBM>sudo find /opt/IBM/WebSphere/ -type d |wc -l

As you can see there is a small difference between the data size. This is not really a problem because the old server is in use, and there could be differences in block size etc. The amount of files is exactly the same so that is more important.

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aixtar.txt · Last modified: 2013/02/25 20:36 by sjoerd