11.9.9 Starting a remote copy Consistency Group 11.9.10 Switching a relationship copy direction 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. 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. 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. 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 Figure 11-140 Starting a remote copy Consistency Group Chapter 11. Advanced Copy Services  591