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.