Copy export acceleration
Copy export acceleration improves the speed of large copy export operations by reducing the number of physical volumes that store a copy of the database used for recovery.
By reducing the number of tapes that contain a copy of the database that is used for recovery, most of the physical volumes that are exported then need to be only ejected, instead of modified and ejected. This difference greatly reduces the time of the export operation. Copy export acceleration uses a copy export request attribute to append the recovery database snapshot to only the first two and last two copy export tapes in a given set. Copy export acceleration can greatly reduce the amount of time spent on a large copy export operation. With the acceleration feature, the resulting list file can be used to determine which volumes contain the database, and therefore should be used during any future restore operation. Since the first and last two volumes that contain the database are not necessarily the first and last two tapes that are physically removed from the library, the list file should be used to determine which four physical volumes contain the database.