Definition of a consistency group

A consistency group is a collection of remote replications with service relationships. You can synchronize, split, or perform primary/secondary switchover of the remote replications in a consistency group.

In medium- and large-sized database applications, data, logs, and modification information are stored on different LUNs. If data on one of the LUNs is unavailable, data on the other LUNs is also invalid. How to keep time consistency between multiple remote replication pairs must be considered if remote disaster recovery needs to be implemented for these LUNs simultaneously. A consistency group ensures that image data of LUNs in multiple remote replication pairs is consistent regarding the time.

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