Volumes can be copied with the copy function of a disk unit and the copy destination disk areas can be recognized as volumes (shadow volumes) and accessed.
To run another service concurrently with the service, the application volume must be replicated. The operation pattern that uses the copy destination disk areas created with the copy function of a disk unit is available as well as the operation pattern that uses proxy volumes, as replications of the volumes used in the service.
See
For the operation mode and the procedure for backup and restore by shadow volumes through the copy function of a disk unit, see "6.7 Backing Up and Restoring through Disk Unit's Copy Functions."
Figure 1.44 Backing Up a Replication Created with the Disk Unit Copy Function
You can configure a disaster recovery system at a place geographically distant using the copy function between disk bodies. If the domain running the service is affected by disaster, the disaster recovery system will conduct the service alternatively using the copy destination disk areas as shadow volumes until the domain recovers from disaster.
Figure 1.45 Disaster Recovery System
