After an upgrade of Tivoli® Storage Manager server to V6.3 or later, if you want to revert to the previous release, you must have the original volume history file. The reason is that the V6.3 or later volume history file has a different format than the earlier volume history file. The newer volume history file cannot be used to restore the Tivoli Storage Manager database to the previous release.
The system saves the previous volume history file under another name to ensure that it is not overwritten.
To restore the Tivoli Storage Manager database, use the saved volume history file.