What Is a Consistency Group?

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A consistency group is a collection of remote replications that have a service relationship with each other. You can simultaneously synchronize, split, or perform a primary/secondary switchover for all the remote replications in a consistency group.

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

Other related questions:
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.

Introduction to the Dorado disk enclosure
Dorado disk enclosures are described as follows: A disk enclosure adopts a modular design and consists of a system enclosure, expansion modules, power modules, and disk modules.

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