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[Help-tar] multivolume extract from non-first archive

From: Sam George
Subject: [Help-tar] multivolume extract from non-first archive
Date: Wed, 16 May 2007 07:35:52 -0600
User-agent: Thunderbird (Macintosh/20070326)


I'm trying to extract data from multivolume archives without starting at the first archive.

The data is on a stand alone network drive which only speaks CIFS and has a file size limitation of 2GB. So I have created my backups by instructing tar to split its archive into 2GB chunks like so:

tar c -L 2000000 --format=posix \
  $(seq -f"--file=v%g.tar" -s" " 1 250) \

It takes several days to complete. Extracting takes a similar length of time. Naturally, if I want to pull something from near the end I'd rather not wait for three or four days. So (after finding the appropriate archive chunk) I tried:

 10 # tar vx -M $(seq -f"--file=/mnt/backup/v%g.tar" -s" " 146 148)
tar: /home/share/D60/725CANON/CRW_2526.CRW: Cannot extract -- file is continued from another volume
tar: Skipping to next header
tar: Error exit delayed from previous errors

I also fiddled with -K and -B parameters but was unable to get it to work. It seems like this ought to be possible. Any ideas?

 11 # tar --version
tar (GNU tar) 1.16.1
Copyright (C) 2006 Free Software Foundation, Inc.
This is free software.  You may redistribute copies of it under the terms of
the GNU General Public License <>.
There is NO WARRANTY, to the extent permitted by law.

Written by John Gilmore and Jay Fenlason.
 12 #


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