The OPC(One Point Copy) function of ETERNUS disk storage systems is used to copy data from a transaction volume to an unused backup volume.
To perform a snapshot fast backup, take the following steps:
Execute swstbackup (Backup execution command) ((1) in the figure below). The following processing will be performed:
If backup volumes under generation management exist for all the generations, the oldest backup volume will be assumed to be unused.
An unused backup volume will be selected from the unused backup volume management area.
Data on the transaction volume will be copied to the selected unused backup volume ((2) to (4) in the following figure).
Backup carrier information will be set.
Figure 4.2 Snapshot fast backup processing
The snapshot fast backup is completed as soon as you confirm the execution of the backup. The actual data copying will be performed internally by the OPC function of ETERNUS disk storage systems.
The QuickOPC function of the snapshot high-speed backup creates a snapshot image by only copying the data updated since the start of previous backup. This reduces the time for physical copying significantly.
For information on the QuickOPC function, see "Chapter 6 Backup Operation by the QuickOPC Function."
Note
If all the generations of backup volumes are being managed, and if no backup volume can be obtained from the unused region in the backup volume management area, backup copies cannot be created.
