Chapter 11. Advanced Copy Services 591
11.9.9  Starting a remote copy Consistency Group
When a remote copy consistency group is created, the remote copy process can be started, 
for all the relationships that are part of the consistency groups. 
To start a consistency group, open the Copy Services → Remote Copy panel, right-click the 
consistency group to be started, and select Start, as shown in Figure 11-140.
Figure 11-140   Starting a remote copy Consistency Group
11.9.10  Switching a relationship copy direction
When a remote copy relationship is in the Consistent synchronized state, the copy direction 
for the relationship can be changed. Only relationships that are not a member of a 
Consistency Group, or the only relationship in a Consistency Group, can be switched. In any 
other case, consider switching the Consistency Group instead.
To switch the direction of a remote copy relationship, complete the following steps:
1. Open the Copy Services →→  Remote Copy panel. 
2. Right-click the relationship to be switched and select Switch, as shown in Figure 11-141.
Figure 11-141   Switching remote copy relationship direction
Important: When the copy direction is switched, it is crucial that no outstanding I/O exists 
to the volume that changes from primary to secondary because all of the I/O is inhibited to 
that volume when it becomes the secondary. Therefore, careful planning is required before 
you switch the copy direction for a relationship.