A Hyperflex stretched cluster is a single cluster with geographically distributed nodes. Both sides of the cluster act as primary for certain user VMs. The data for these VMs is replicated synchronously on the other site. Stretched clusters enable you to access the entire cluster even if one of the sites were to completely go down. Typically these sites are connected with a low latency, dedicated, high-speed link between them.
HyperFlex Stretched Cluster enables you to deploy an Active-Active disaster avoidance solution for mission critical workloads requiring high uptime (near zero Recovery Time Objective) and no data loss (zero Recovery Point Objective).
Prerequisites
Requirements
All the nodes in the cluster should be of the same M5 models (All HX220 M5) or (HX 240 M5)
Only M5 node are supported in sctretch Clusters
Stretch clusters is only supported on ESXi HX platforms
Each site should have a minimum of 2 nodes
ALL the VLANs used on both clusters have to be SAME
Stretch cluster configuration requires a Witness VM
Stretch Clustres require the same number of IP addresses that is needed for a six node cluster
Only one instance of vCenter is used for a stretch cluster
vCenter with DRS and HA is required for the stretch cluster to work properly
References:
https://www.cisco.com/c/en/us/support/docs/hyperconverged-infrastructure/hyperflex-hx-data-platform/214489-hyperflex-stretch-clusters-deployment-gu.html
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