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Full Discussion: Slow listing of LTo5 tape contents
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
This User Gave Thanks to bakunin For This Post:
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LEARN ABOUT DEBIAN

gpodder-backup

GPODDER-BACKUP(1)						   User Commands						 GPODDER-BACKUP(1)

NAME

       gpodder-backup - Backup and restore utility for gPodder user data

SYNOPSIS

       gpodder-backup [--create|--extract] <archive.gpo.tar.gz> [options] gpodder-backup --purge

DESCRIPTION

       This utility can be used to create a dump of the current gPodder data (configuration files + downloads), optionally replacing the real con-
       tents of the download folder with zero-byte files (for submitting your data to a bug report without having to transfer lots of data).

OPTIONS

       --version
	      show program's version number and exit

       -h, --help
	      show this help message and exit

       -c <FILE>, --create=<FILE>
	      Create a new archive

       -x <FILE>, --extract=<FILE>
	      Extract an existing archive

       -f, --fake-downloads
	      Store downloads as zero-byte files in backup

       -n, --no-covers
	      Do not include cover files in archive

       -D <DIR>, --destination=<DIR>
	      Extract downloads in different folder

       -P, --purge
	      Remove current data (can be combined with --extract)

USAGE FOR BUG REPORTING

       This command is useful if you want to report a bug in gPodder:

       gpodder-backup --create bug123.gpo.tar.gz --fake-downloads
	      Backup your current data to file bug123.gpo.tar.gz, but don't store download data (create zero-size dummy files  instead).  You  can
	      then attach bug123.gpo.tar.gz to the bug report.

       If you are instructed to try gPodder from a "clean state", you can use the following command (be sure to backup your data before!):

       gpodder-backup --purge
	      Remove all gPodder data, so you can start from a clean state

EXAMPLES

       gpodder-backup --create today.gpo.tar.gz
	      Backup your current data to file today.gpo.tar.gz

       gpodder-backup --extract mybackup.gpo.tar.gz
	      Restore (without purging) the contents of mybackup.gpo.tar.gz

       gpodder-backup --extract default.gpo.tar.gz --purge
	      Remove current data, then restore the contents of default.gpo.tar.gz

       gpodder-backup --purge
	      Remove all gPodder data, so you can start from a clean state

EXTRACTING FAKED DOWNLOADS

       Please  note  that  any	existing  downloads will be overwritten with zero-byte files when using the --extract option of the gpodder-backup
       utility with a backup created with --fake-downloads

AUTHOR

       gpodder-backup was written by Thomas Perl (thp@gpodder.org)

gpodder-backup 1.0						   December 2010						 GPODDER-BACKUP(1)
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