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Product : Cisco, HyperFlex [HCI]/4.0, x86
Feature : SC Configuration, Disaster Recovery, Data Availability
Content Owner:  Herman Rutten
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Summary
vSphere: 3-sites = two active sites + tie-breaker in 3rd site
Details
The use of a Witness Server automates failover decisions in order to avoid split-brain scenarios like network partitions and remote site failures. The witness is deployed as a small VM on a third site.

The RTT to the third site should not exceed 200ms and there should be at least 100Mbps of bandwidth available.