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Filesystems, Disks and Memory
problems with tar multivolume
Post 27376 by Perderabo on Friday 30th of August 2002 08:22:38 AM
08-30-2002
You would seem to be up the creek without a paddle. 
Usually, when a large unix shop has a dedicated backup server, it will acquire some software to handle things. We use Veritas Netbackup and I have to say it is a dream. But it should be, we spent several hundred thousand dollars on our backup system. (You did ask how everyone else does it.)
I'm not a linux expert, but in mainstream unix, cpio was the first program to be able to handle multiple volumes. At some point, tar picked this up also (I think it was a Posix mandate.) And the BSD backup/restore programs can handle multiple volumes. And OSF introduced pax which can handle multiple volumes. Since you're running linux, you may have some other options, I'm not sure. But if you want to handle multiple tape volumes, the tape drive must be opened by a program that can handle multiple volumes. dd cannot.
One option is to give up on multiple volumes. Figure out how much will fit on a tape and then run several jobs. Each job will write to a single volume. You will need to monitor this solution closely to make sure that each job always fits on its tape.
The other option that I see for you is to remote mount the fileserver's files onto the backupserver. I gather that you tried this and ran into permission problems. Although I have never used linux, I believe that the permission problem can be solved. Typically very special steps are needed on the fileserver to enable remote root access to remotely mounted files. If you detail the steps that you used to accomplish the remote mount, I'll bet that one of our linux experts can help you out with this.
Usually, when a large unix shop has a dedicated backup server, it will acquire some software to handle things. We use Veritas Netbackup and I have to say it is a dream. But it should be, we spent several hundred thousand dollars on our backup system. (You did ask how everyone else does it.)
I'm not a linux expert, but in mainstream unix, cpio was the first program to be able to handle multiple volumes. At some point, tar picked this up also (I think it was a Posix mandate.) And the BSD backup/restore programs can handle multiple volumes. And OSF introduced pax which can handle multiple volumes. Since you're running linux, you may have some other options, I'm not sure. But if you want to handle multiple tape volumes, the tape drive must be opened by a program that can handle multiple volumes. dd cannot.
One option is to give up on multiple volumes. Figure out how much will fit on a tape and then run several jobs. Each job will write to a single volume. You will need to monitor this solution closely to make sure that each job always fits on its tape.
The other option that I see for you is to remote mount the fileserver's files onto the backupserver. I gather that you tried this and ran into permission problems. Although I have never used linux, I believe that the permission problem can be solved. Typically very special steps are needed on the fileserver to enable remote root access to remotely mounted files. If you detail the steps that you used to accomplish the remote mount, I'll bet that one of our linux experts can help you out with this.
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LEARN ABOUT SUSE
git-tar-tree
GIT-TAR-TREE(1) Git Manual GIT-TAR-TREE(1) NAME
git-tar-tree - Create a tar archive of the files in the named tree object SYNOPSIS
git tar-tree [--remote=<repo>] <tree-ish> [ <base> ] DESCRIPTION
THIS COMMAND IS DEPRECATED. Use git archive with --format=tar option instead (and move the <base> argument to --prefix=base/). Creates a tar archive containing the tree structure for the named tree. When <base> is specified it is added as a leading path to the files in the generated tar archive. git tar-tree behaves differently when given a tree ID versus when given a commit ID or tag ID. In the first case the current time is used as modification time of each file in the archive. In the latter case the commit time as recorded in the referenced commit object is used instead. Additionally the commit ID is stored in a global extended pax header. It can be extracted using git get-tar-commit-id. OPTIONS
<tree-ish> The tree or commit to produce tar archive for. If it is the object name of a commit object. <base> Leading path to the files in the resulting tar archive. --remote=<repo> Instead of making a tar archive from local repository, retrieve a tar archive from a remote repository. CONFIGURATION
tar.umask This variable can be used to restrict the permission bits of tar archive entries. The default is 0002, which turns off the world write bit. The special value "user" indicates that the archiving user's umask will be used instead. See umask(2) for details. EXAMPLES
git tar-tree HEAD junk | (cd /var/tmp/ && tar xf -) Create a tar archive that contains the contents of the latest commit on the current branch, and extracts it in /var/tmp/junk directory. git tar-tree v1.4.0 git-1.4.0 | gzip >git-1.4.0.tar.gz Create a tarball for v1.4.0 release. git tar-tree v1.4.0^{tree} git-1.4.0 | gzip >git-1.4.0.tar.gz Create a tarball for v1.4.0 release, but without a global extended pax header. git tar-tree --remote=example.com:git.git v1.4.0 >git-1.4.0.tar Get a tarball v1.4.0 from example.com. git tar-tree HEAD:Documentation/ git-docs > git-1.4.0-docs.tar Put everything in the current head's Documentation/ directory into git-1.4.0-docs.tar, with the prefix git-docs/. AUTHOR
Written by Rene Scharfe. DOCUMENTATION
Documentation by David Greaves, Junio C Hamano and the git-list <git@vger.kernel.org[1]>. GIT
Part of the git(1) suite NOTES
1. git@vger.kernel.org mailto:git@vger.kernel.org Git 1.7.1 07/05/2010 GIT-TAR-TREE(1)