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Full Discussion: Tape compression
Operating Systems AIX Tape compression Post 302422054 by bakunin on Monday 17th of May 2010 10:28:23 AM
Old 05-17-2010
The IBM drives have a hardware compression and feeding them compressed data might well have an adverse effect.

I wonder why you use DAT72 tapes, because the 7214 comes with one of two possible drives: one for DAT160 (80GB) or DAT320 (160GB) tapes or an Ultrium drive for LTO4 tapes (800GB).

The drive you use (obviously the former one) is downward-compatible with DAT72 (and DDS4, for that matter, according to IBMs product description), but you could simply switch to another medium and use its real capacity.

Btw.: a simple search for "IBM 7214" in Google revealed the mentioned link as first hit and the information about the drive options are near the top of the linked page. It is not forbidden to use Google prior to opening a thread here.

I hope this helps.

bakunin
 

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BACKUP_DELHOST(8)					       AFS Command Reference						 BACKUP_DELHOST(8)

NAME
backup_delhost - Deletes a Tape Coordinator entry from the Backup Database SYNOPSIS
backup delhost -tapehost <tape machine name> [-portoffset <TC port offset>] [-localauth] [-cell <cell name>] [-help] backup delh -t <tape machine name> [-p <TC port offset>] [-l] [-c <cell name>] [-h] DESCRIPTION
The backup delhost command deletes the indicated Tape Coordinator entry from the Backup Database. It is then impossible to submit backup operations to that Tape Coordinator, even if it is still running. To keep configuration information consistent, also remove the corresponding entry from the /var/lib/openafs/backup/tapeconfig file on the Tape Coordinator machine. To list the Tape Coordinator machines and port offsets defined in the Backup Database, issue the backup listhosts command. OPTIONS
-tapehost <tape machine name> Specifies the hostname of the machine housing the Tape Coordinator to delete. -portoffset <TC port offset> Specifies the port offset number of the Tape Coordinator to delete. If omitted, it defaults to 0. If provided, it is an integer between 0 (zero) and 58510, and must match the port offset number assigned to the same combination of Tape Coordinator and tape device or file in the /var/lib/openafs/backup/tapeconfig file on the Tape Coordinator machine indicated by the -tapehost argument. -localauth Constructs a server ticket using a key from the local /etc/openafs/server/KeyFile file. The backup command interpreter presents it to the Backup Server, Volume Server and VL Server during mutual authentication. Do not combine this flag with the -cell argument. For more details, see backup(8). -cell <cell name> Names the cell in which to run the command. Do not combine this argument with the -localauth flag. For more details, see backup(8). -help Prints the online help for this command. All other valid options are ignored. EXAMPLES
The following command deletes the Backup Database entry for the Tape Coordinator with port offset 2 on the Tape Coordinator machine "backup3.abc.com": % backup delhost -tapehost backup3.abc.com -portoffset 2 PRIVILEGE REQUIRED
The issuer must be listed in the /etc/openafs/server/UserList file on every machine where the Backup Server is running, or must be logged onto a server machine as the local superuser "root" if the -localauth flag is included. SEE ALSO
backup(8), backup_addhost(8), backup_listhosts(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_DELHOST(8)
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