Advantages (+) and disadvantages (-) of each form of organization

Central administration

Decentralized administration

All pubsets are administered centrally:
1 directory file for migration
1 directory file for backup
1 directory file for archival

Each pubset is administered separately:
1 directory file for migration per pubset
1 directory file for backup per pubset
1 directory file for archival per pubset
1 directory file for version backup per pubset

Version backup is only possible within decentralized administration.

+	Backup and migration require only 1 HSMS statement for all pubsets.

-	Backup, version backup and migration require 1 HSMS statement per pubset.

+	ARCHIVE automatically synchronizes the backup or migration of all pubsets.

-	/SECURE RESOURCE-ALLOCATION is used on the output device to synchronize the tasks of different pubsets. If the pubsets are of different sizes, this may take additional time.

+	Optimum utilization of save volumes for small pubsets (1 volume per save run for multiple pubsets).

-	Uneconomical utilization of save volumes for small pubsets (1 volume per save run per pubset). However, utilization of the volumes can be enhanced through continuation during the subsequent backups/migrations.

-	Uses large directory files: Seriously negative impact on performance

+	Uses smaller directory files, improving runtime performance and reducing access conflicts.

-	If a pubset is migrated to a different home pubset, the backup is no longer available without additional intervention (COPY-SAVE-FILE).

+	If a pubset is migrated to a different home pubset, the backup is still available. If the pubset does not contain the directory file, it must be copied.

-	If the directory file is located on the home pubset and the pubset crashes, the directory file must be restored. Users cannot resume work until the HSMS environment has been completely restored.

+	If the home pubset crashes, processing can continue with a different pubset as soon as the control file has been restored. Processing can continue with another home pubset once the environment has been redefined; the directory files are retained.

-	The serial processing of jobs in each archive has significant repercussions.

+	The serial processing of jobs has little effect.

-	A request cannot be restarted after the home pubset has changed.

-	The archive definitions are lost when the home pubset changes.