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When you use disaster recovery

If a mishap or disaster disables or destroys the storage systems at a primary storage site, you can invoke a failover process that breaks the SnapMirror relationship between the primary and secondary partners and transfers primary storage site functions (including continued user access) to the mirror partners at the secondary storage site.

In a typical disaster recovery protection implementation, the storage systems at the primary storage site use underlying SnapMirror processes to maintain recent Snapshot copies and active copies of their data. These copies are located on SnapMirror partners at a secondary site that is located a safe distance from the primary storage site.

With sufficient warning of an impending event that threatens the primary storage site, the administrator can invoke a final Snapshot copy transfer from the primary site to the secondary storage site and can monitor the entire system for failover readiness in case there needs to be failover.