Example of a stretch MetroCluster configuration with E-Series storage arrays
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In a stretch MetroCluster configuration with E-Series storage array LUNs, you can directly connect the storage controllers and the storage arrays. Unlike other array LUNs, FC switches are not required.
The Direct Attach support for Stretch MetroCluster Configuration with NetApp E-Series array Knowledgebase article provides examples of configurations with E-Series array LUNs.