The One Point Copy (OPC) / Remote One Point Copy (ROPC) function of the Fujitsu ETERNUS storage system is used to copy data from a transaction volume to an unused backup volume. Backup data is then copied from the backup volume to tape.
Snapshot high-speed backup is performed as follows:
When "11.2.2.1 acmbackup (Backup command)" is executed (Step 1 in the figure below, "Snapshot high-speed backup processing"), the following processing is performed:
If backup volumes under generation management exist for all the generations, the oldest backup volume will be treated as an unused backup volume.
An unused backup volume will be acquired from the unused backup volume management area.
Data on the transaction volume will be copied to the unused backup volume (Steps 2 to 4 in the figure below, "Snapshot high-speed backup processing"). Copy is also performed from the backup volume to tape. The timing for starting copy to tape can be selected from either Step 2 or Step 4 in the figure below, "Snapshot high-speed backup processing".
Backup carrier information will be set.
Figure 5.3 Snapshot high-speed backup processing
In snapshot high-speed backup, backup to a disk is complete at Step 1 in the figure above, "Snapshot high-speed backup processing" and backup history information is created. The actual data copying will be internally performed by the OPC function of the Fujitsu ETERNUS storage system.
The command completion timing can be selected from the history created either in the disk backup history information or the tape backup history information using the relevant option.
Using the QuickOPC function in the snapshot high-speed backup, which physically copies only data that has been modified since the start of the previous backup, can create a complete snapshot image, while greatly reducing the time taken for physical copying.
For information on the QuickOPC function, refer to "Chapter 7 Backup Operations Using the QuickOPC Function".
Note
If all generations of backup volumes are managed, and if no backup volume can be obtained from the unused region in the backup volume management area, backup copies cannot be created.
Backup using ROPC is restricted to the ETERNUS storage system within the same Storage Server that supports ROPC.
