Overview of global-active device

REST API Reference Guide for Virtual Storage Platform 5000, Virtual Storage Platform E Series, and Virtual Storage Platform G/F Series

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Global-active device enables you to duplicate volumes between two storage systems to improve availability of the storage systems. If you register resources of each storage system in the same virtual storage machine and specify the same virtual LDEV ID for the volumes to be paired, the host can handle the volumes as a volume of a storage system. I/O from the host can be received by both storage systems. If data is written in one volume, the data is automatically synchronized with another volume.

If you issue an API request from a REST API client, you can create a global-active device pair, or perform operations on pairs when stopping either storage system for maintenance.

To perform operations on global-active device pairs, you must set up a quorum in advance. If a path or a storage system fails, the quorum disk determines the storage system on which I/O operations from the server will continue.

For a global-active device in a cross-path configuration (using a Fibre Channel connection), you can change the volume settings to enable the ALUA attribute or to set the priority levels of ALUA paths.

For details on global-active device, see the Global-Active Device User Guide.