Correct answer is B : disabling the host controller cache and advanced features is a requirement to achieve the best of vSAN caching and other features.
A : not related
C : the hosts drives must be in HBA mode, or in the worst case depending on the controller, configured in RAID-0. The FFT=1 will be manage by vSAN if necessary
D : the memory minimum depends on the cluster configuration (OSA/ESA), there is strict minimum (and 64GB will be certainly unsufficient)
The ESXi host's drives must be configured in RAID 1 to support Failures to Tolerate of 1. According to VMware's vSAN 6.7 Configuration Maximums guide, when deploying a vSAN 2-node cluster with a shared witness, the ESXi hosts must be configured in RAID 1 to support the Failure to Tolerate of 1. This is because a vSAN 2-node cluster with a shared witness will have a single point of failure, so it is important to ensure that the ESXi hosts are configured with redundancy to prevent data loss.
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