Guidelines
Consider the following guidelines when creating a HyperFlex Stretched Cluster:
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HXDP Enterprise Edition licensing is required to use the HyperFlex Stretched Cluster feature.
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vSphere Enterprise Plus licensing is required for full featured HyperFlex Stretched Cluster functionalities like VM load balancing and VM migration.
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Ensure that DRS is enabled.
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Supported Stretched Cluster scale:
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There must be a minimum of 2 nodes on each site. The minimum overall cluster size across both sites is 4.
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Small Form Factor (SFF). The maximum cluster size across both sites is 64. The maximum converged node count is 16 per site. The compute to converged node ratio can be 2:1, while the maximum limit of nodes per site must not exceed 32. For example, you can have 11 converged and 21 compute nodes per site.
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Large Form Factor (LFF). The maximum cluster size is 48. The maximum converged node count is 8 per site. The compute to converged node ratio can be 2:1, while the maximum limit of nodes per site must not exceed 24. For example, you can have 8 converged and 16 compute nodes per site.
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There must be a redundant fabric interconnect configuration on each site.
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There must be symmetric cluster configuration across both sites. The number of nodes and the model of HX nodes should be the same on both sites.
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VMs are placed correctly within site affinity only if VMware HA and DRS are enabled before VM creation. Otherwise, the correct placement of VM for proper affinity is not guaranteed.
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HyperFlex Native Replication is supported between Stretched Clusters, and between Stretched Clusters and standard clusters.
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From HyperFlex release 3.0, the Stretched Clusters running on HyperFlex release 3.0 or later can be upgraded to the current release. For more details, see Stretched Clusters Upgrade.
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It is a best practice to have two datastores one per site, with the respective affinity.