In documentation for FT (https://docs.vmware.com/en/VMware-vSphere/8.0/vsphere-availability/GUID-2A87B967-5BBB-4394-B1E6-EE87D50A2A86.html), it is stated: "vSAN metro clusters are not supported with FT.". My understanding is then, that a vSAN (2-node) Stretched Cluster will not support FT.
My question is actually regarding the use case for a vSAN (2-node) Stretched Cluster, if the the 2 vSAN nodes, while being in separate datacenter buildings, have the vmkernel connection for vSAN made by a directly connected 25 Gb fiber (latency around 0,1 msec.). This setup use of cause the supported Witness separation, i.e. the Witness and other vmkernels use the slower switched network.
The question is then, if such architecture could be configured as a 2-node cluster (instead of a Stretched Cluster)? I guess the recommendation to use a Metro/Stretched Cluster when having 2 separate buildings is with the assumption, that using a network with several switches will introduce increased latency and so the need for a Stretched Cluster configuration with better tolerance for latency.
The motivation for my question is, to understand where the vSAN/FT limitations actually are, so in the end to understand if an architecture with 2 vSAN nodes in separate building (+additional wittness server), but with a separate direct 25 Gb vSAN vmkernel connection and an additional separate direct 25 Gb FT vmkernel will be supported and functional for both vSAN and FT?
Best regards
Henrik