Consistency groups

A consistency group is an optional container for FlashCopy^® mappings, Global Mirror relationships, and Metro Mirror relationships. When you use a consistency group, you can complete copy operations on the entire group instead of the individual mappings.

You can add many mappings or relationships to a consistency group. Review and consider the following guidelines.

FlashCopy^® mappings, Global Mirror relationships, and Metro Mirror relationships cannot appear in the same consistency group.
Relationships can be added to consistency groups if the state of the relationship matches the state of the consistency group.
To enable consistency protection for a consistency group, consistency protection must be enabled on each relationship within that consistency group.
For example, if a consistency group consists of four Metro Mirror relationships that are configured with secondary change volumes, the data of the entire consistency group can be protected during resynchronization. However, if a secondary change volume is not configured on one of the Metro Mirror relationships, consistency protection is lost for all of the relationships within the consistency group.