Importance

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Abstract

The present invention provides a method and apparatus for increasing availability of an application during fail-back from a secondary site to a primary site following a failure at the primary site. The method includes copying data from active storage volumes to secondary storage volumes of the secondary site while the application runs on the secondary site and updates the active storage volumes. Once the secondary storage volumes of the secondary site are updated, the data is re-synchronized from the secondary storage volumes of the secondary site to the primary storage volumes of the primary site. The steps of copying the data and resynchronizing the data are repeated for data updated by the application, during the resynchronization, until a time required to complete the resynchronization step for the updated data is within an acceptable downtime for the application. Once this step is complete, the application is failed-back to the primary site by bringing up the application at the primary site.

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First Claim