By cooperation with the OPC (One Point Copy) function provided by ETERNUS Disk storage system, snapshots can be created instantly at any given moment.
Unlike snapshot by synchronization, instant snapshot by OPC does not require synchronization with volumes in advance, so scheduling is unnecessary. However, as the copying process will take place within the disk array after the snapshot has been created, I/O performance of the disk will be reduced until copying is complete.
QuickOPC function is also supported. When you use QuickOPC function in creating snapshot, only the differences (updated parts) are copied from the second time. This will reduce copy amount. Therefore, QuickOPC function is suitable for backup of large scale database and so on which require shortening of time.
Note
Instant snapshot by OPC is only available on ETERNUS Disk storage system with the OPC function.
Figure 1.34 Instant Snapshot by OPC
