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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
This User Gave Thanks to bakunin For This Post:
 

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BACKUP_QUIT(8)						       AFS Command Reference						    BACKUP_QUIT(8)

NAME
       backup_quit - Leaves interactive mode

SYNOPSIS
       quit [-help]

       q [-h]

DESCRIPTION
       The backup quit command exits interactive mode, returning the issuer to the regular shell prompt at which the backup or backup interactive
       command was issued to enter interactive mode. The command has no effect when issued outside interactive mode. Issuing the Ctrl-D command
       also exits interactive mode.

CAUTIONS
       To exit interactive mode, all jobs must be completed. Use the backup jobs command to list any jobs currently pending or executing, and the
       backup kill command to terminate them as necessary.

OPTIONS
       -help
	   Prints the online help for this command. All other valid options are ignored.

EXAMPLES
       The following command exits interactive mode:

	  backup> quit
	  %

PRIVILEGE REQUIRED
       None

SEE ALSO
       backup(8), backup_interactive(8), backup_jobs(8), backup_kill(8)

COPYRIGHT
       IBM Corporation 2000. <http://www.ibm.com/> All Rights Reserved.

       This documentation is covered by the IBM Public License Version 1.0.  It was converted from HTML to POD by software written by Chas
       Williams and Russ Allbery, based on work by Alf Wachsmann and Elizabeth Cassell.

OpenAFS 							    2012-03-26							    BACKUP_QUIT(8)
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