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Operating Systems AIX Slow listing of LTo5 tape contents Post 302806145 by bakunin on Sunday 12th of May 2013 02:59:59 PM
Old 05-12-2013
The problem is that "restore"/"backup" file format has no "table of contents", so basically "restore" has to read the whole file to generate it. The limiting factor is the speed of the tape (this is probably the case with the "backup" too).

What you can do is: instead of piping the file list directly into "backup" create a file first. Then write this file first at the rmt-device, only then use the same list as input to "backup". Write to the "/dev/rmtN.1" instead of "/dev/rmtN", this is the drive without "rewind on exit", so your "table of contents" will be the first entry on the cartridge. You can restore this single file to get/search a list of files backed up in this session.

Backup (schematic)
Code:
find .... -print > /tmp/filestobackup
tctl -f /dev/rmtN.1 rewind
tar cf /dev/rmtN.1 /tmp/filestobackup
backup -ivf /dev/rmtN.1 < /tmp/filestobackup
tctl -f /dev/rmtN rewoffl

Search (=restore toc only)
Code:
tar xf /dev/rmtN

Restore (schematic, skip first entry, then restore normally)
Code:
tctl fsf 1 -f /dev/rmtN.1
restore -lTf /dev/rmtN.1

I hope this helps.

bakunin
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bup-restore(1)						      General Commands Manual						    bup-restore(1)

NAME
bup-restore - extract files from a backup set SYNOPSIS
bup restore [--outdir=outdir] [-v] [-q] DESCRIPTION
bup restore extracts files from a backup set (created with bup-save(1)) to the local filesystem. The specified paths are of the form /branch/revision/path/to/file. The components of the path are as follows: branch the name of the backup set to restore from; this corresponds to the --name (-n) option to bup save. revision the revision of the backup set to restore. The revision latest is always the most recent backup on the given branch. You can dis- cover other revisions using bup ls /branch. /path/to/file the original absolute filesystem path to the file you want to restore. For example, /etc/passwd. Note: if the /path/to/file is a directory, bup restore will restore that directory as well as recursively restoring all its contents. If /path/to/file is a directory ending in a slash (ie. /path/to/dir/), bup restore will restore the children of that directory directly to the current directory (or the --outdir). If the directory does not end in a slash, the children will be restored to a subdirectory of the current directory. See the EXAMPLES section to see how this works. OPTIONS
-C, --outdir=outdir create and change to directory outdir before extracting the files. -v, --verbose increase log output. Given once, prints every directory as it is restored; given twice, prints every file and directory. -q, --quiet don't show the progress meter. Normally, is stderr is a tty, a progress display is printed that shows the total number of files restored. EXAMPLE
Create a simple test backup set: $ bup index -u /etc $ bup save -n mybackup /etc/passwd /etc/profile Restore just one file: $ bup restore /mybackup/latest/etc/passwd Restoring: 1, done. $ ls -l passwd -rw-r--r-- 1 apenwarr apenwarr 1478 2010-09-08 03:06 passwd Restore the whole directory (no trailing slash): $ bup restore -C test1 /mybackup/latest/etc Restoring: 3, done. $ find test1 test1 test1/etc test1/etc/passwd test1/etc/profile Restore the whole directory (trailing slash): $ bup restore -C test2 /mybackup/latest/etc/ Restoring: 2, done. $ find test2 test2 test2/passwd test2/profile SEE ALSO
bup-save(1), bup-ftp(1), bup-fuse(1), bup-web(1) BUP
Part of the bup(1) suite. AUTHORS
Avery Pennarun <apenwarr@gmail.com>. Bup unknown- bup-restore(1)
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