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Implementing the IBM System Storage SAN Volume Controller with IBM Spectrum Virtualize V7.6 by Marcin Tabinowski, Lev Sturmer, Anthony Saine, Jon Parkes, Libor Miklas, Tarik Jose Maluf, Hartmut Lonzer, Maximilian Hart, Jon Tate

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Stretched Cluster
In this appendix, we briefly describe the IBM System Storage SAN Volume Controller (SVC) Stretched Cluster (formerly known as a Split input/output (I/O) Group) concepts and main functions.
We also explain the term Enhanced Stretched Cluster (ESC), and the IBM HyperSwap technology introduced in the IBM Spectrum Virtualize V7.5, and how they differ from each other.
Technical details or implementation guidelines are not presented ...

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