Operating System Software Owner manual

Specifically, Remote Copy replicates data from the primary volume groups, which you name and
which reside on the primary system, to the secondary volume groups, which Remote Copy names
and which reside on the backup system.
For more information, see “Creating Remote Copy Volume Groups” (page 71).
Additional Information:
• “Volume Groups” (page 190)
• “Natural Direction of Replication” (page 192)
Changing the Direction of Data Flow
Under certain circumstances, you must temporarily switch the direction of data flow:
• disaster recovery
• system maintenance/replacement
• scheduled downtime
Switching the direction of data flow temporarily reverses the roles of the primary and backup
systems.
Additional Information:
• “Recovering from Disaster” (page 102)
• “Changing Secondary Volume Groups to Primary” (page 93)
System Roles and Bidirectional Configurations
In bidirectional configurations, both systems in the Remote Copy pair are both primary and backup
systems.
To distinguish the roles:
• The system that contains the primary volume group is considered the primary system.
• The system that contains the secondary volume group is considered the backup system.
Therefore, the system role changes depending on the volume group you are working with.
Remote Copy Target System 183