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
This User Gave Thanks to bakunin For This Post:
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LEARN ABOUT REDHAT
smbtar
SMBTAR(1) SMBTAR(1)
NAME
smbtar - shell script for backing up SMB/CIFS shares directly to UNIX tape drives
SYNOPSIS
smbtar -s server [ -p password ] [ -x services ] [ -X ] [ -d directory ] [ -u user ] [ -t tape ] [ -t tape ] [ -b blocksize ] [ -N
filename ] [ -i ] [ -r ] [ -l loglevel ] [ -v ] filenames
DESCRIPTION
This tool is part of the Samba suite.
smbtar is a very small shell script on top of smbclient(1) which dumps SMB shares directly to tape.
OPTIONS
-s server
The SMB/CIFS server that the share resides upon.
-x service
The share name on the server to connect to. The default is "backup".
-X Exclude mode. Exclude filenames... from tar create or restore.
-d directory
Change to initial directory before restoring / backing up files.
-v Verbose mode.
-p password
The password to use to access a share. Default: none
-u user
The user id to connect as. Default: UNIX login name.
-t tape
Tape device. May be regular file or tape device. Default: $TAPE environmental variable; if not set, a file called tar.out .
-b blocksize
Blocking factor. Defaults to 20. See tar(1) for a fuller explanation.
-N filename
Backup only files newer than filename. Could be used (for example) on a log file to implement incremental backups.
-i Incremental mode; tar files are only backed up if they have the archive bit set. The archive bit is reset after each file is read.
-r Restore. Files are restored to the share from the tar file.
-l log level
Log (debug) level. Corresponds to the -d flag of smbclient(1) .
ENVIRONMENT VARIABLES
The $TAPE variable specifies the default tape device to write to. May be overridden with the -t option.
BUGS
The smbtar script has different options from ordinary tar and tar called from smbclient.
CAVEATS
Sites that are more careful about security may not like the way the script handles PC passwords. Backup and restore work on entire shares,
should work on file lists. smbtar works best with GNU tar and may not work well with other versions.
DIAGNOSTICS
See the DIAGNOSTICS section for the smbclient(1)
command.
VERSION
This man page is correct for version 2.2 of the Samba suite.
SEE ALSO
smbd(8) smbclient(1) smb.conf(5)
AUTHOR
The original Samba software and related utilities were created by Andrew Tridgell. Samba is now developed by the Samba Team as an Open
Source project similar to the way the Linux kernel is developed.
Ricky Poulten <URL:mailto:poultenr@logica.co.uk> wrote the tar extension and this man page. The smbtar script was heavily rewritten and
improved by Martin Kraemer <URL:mailto:Martin.Kraemer@mch.sni.de>. Many thanks to everyone who suggested extensions, improvements, bug
fixes, etc. The man page sources were converted to YODL format (another excellent piece of Open Source software, available at
ftp://ftp.icce.rug.nl/pub/unix/ <URL:ftp://ftp.icce.rug.nl/pub/unix/>) and updated for the Samba 2.0 release by Jeremy Allison. The conver-
sion to DocBook for Samba 2.2 was done by Gerald Carter.
19 November 2002 SMBTAR(1)