If disks are used as backup media, the following variables must be set.
Number of preservation generations
The number of preservation generation means how many generations of backup data should be preserved.
The snapshot high-speed backup first releases the oldest generation from generation management. For this reason, if a fault such as a system failure occurs during backup operation, the oldest generation may have been released and the required number of generations of backup data may not exist. Fujitsu recommends re-executing backup immediately to create the required number of generations of backup data.
If the snapshot high-speed backup operation is performed with 1 specified for the number of preservation generations, Fujitsu recommends using the operation mode in which backup data is saved additionally to tape.
The synchronous high-speed backup releases the oldest generation from generation management after completion of backup of the latest generation. To keep complete history information, therefore, "number of preservation generations + 1" backup volumes are required.
Number of days (interval)
Set the number of days between required backups.
If the number of days after the last backup is exceeded without a backup being executed, a delay message is displayed.
Backup is not executed automatically, even if the number of days between backups is set.
Set the number using "11.2.1.5 acmbkpolset (Disk backup policy setting command)".
