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IBM DS8870 Copy Services for Open Systems by Bertrand Dufrasne, Sherri Brunson, Don Skilton, Warren Stanley, Alexander Warmuth, Mark Wells

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Global Mirror overview
This chapter provides an overview of Global Mirror. It describes the necessity for data consistency at a distant secondary site when synchronous data replication, such as Metro Mirror, is not possible. It explains how Global Mirror works in a manner similar to a distributed application, that is, in a server and client relationship. Finally, this chapter provides a step-by-step process to establish a Global Mirror environment. The chapter concludes with an overview of multiple Global Mirror master session support.
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