This section explains backup and restoration in the Tape Backup function of AdvancedCopy Manager.
The Tape Backup function of AdvancedCopy Manager uses the Advanced Copy Function (OPC/EC) of Fujitsu ETERNUS storage systems to implement high-speed backup between volumes, regardless of the volume capacity. Once the data is backed up to the destination volume it is copied from there to tape. Therefore, data can be backed up to tape and disk by stopping transaction for the same duration as when data is backed up only to a disk.
Backup that uses the One Point Copy (OPC) or Remote One Point Copy (ROPC) function of Fujitsu ETERNUS storage systems is called "snapshot high-speed backup". Backup that uses the Equivalent Copy (EC) or Remote Equivalent Copy (REC) function is called synchronized high-speed backup.
Automatic snapshot backup can be scheduled without first estimating its duration because it does not require backup synchronous processing. Note, however, that when the save number is 1, a situation may occur where there is no backup data, because a snapshot backup deletes the history prior to copy processing.
Synchronized high-speed backup deletes the history after the completion of backup processing, so in this case a situation where backup data does not exist will not occur, even if the generation number is 1. However, synchronized high-speed backup requires one more backup volume than snapshot fast backup. Synchronized high-speed backup also requires synchronized backup processing before 11.2.2.1 acmbackup (Backup command) is entered. Therefore, execution of automatic synchronized high-speed backup must be scheduled so that the time required for synchronized processing is estimated in advance. Synchronized backup processing is then started based on the estimated time, and 11.2.2.1 acmbackup (Backup command) is entered after equivalency maintenance status has been reached.
The Tape Backup function of AdvancedCopy Manager automatically selects and manages media (backup volumes and tapes) used for backup.
The Tape Backup function of AdvancedCopy Manager also manages the history and generations of backup data, so backup data can be restored from past generations to the latest generation.
Figure 5.1 Backup volume management
Figure 5.2 Tape management
