Which vSAN cluster type is the vSAN Witness a member of?

A vSAN Witness has connectivity to a vSAN cluster with supported maximum latency of 500 milliseconds round-trip time (RTT). Which vSAN cluster type is the vSAN Witness a member of?
A. vSAN stretched cluster with 4 nodes in each site
B. vSAN 2-node direct connected cluster
C. 4-node vSAN cluster using erasure coding
D. 16-node vSAN cluster with nested fault domains

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6 thoughts on “Which vSAN cluster type is the vSAN Witness a member of?

  1. The answer is NOT A for a couple of reasons. Firstly, the witness cannot be part of the stretch cluster. The cluster contains only the nodes accessing/contributing to storage. Secondly, the latency has to be 200 ms or less round trip.

    https://storagehub.vmware.com/t/vmware-vsan/vsan-stretched-cluster-guide/networking-and-latency-requirements-5/:

    “The latency to the witness is dependent on the number of objects in the cluster. VMware recommends that on vSAN Stretched Cluster configurations up to 10+10+1, a latency of less than or equal to 200 milliseconds is acceptable, although if possible, a latency of less than or equal to 100 milliseconds is preferred. For configurations that are greater than 10+10+1, VMware requires a latency of less than or equal to 100 milliseconds.”

  2. B
    r two node ROBO configurations, there is a 5ms RTT between data sites and a 500ms RTT between the data sites and the witness.

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