Virtual SAN has a particular set of limitations regarding storage, host, and network limitations. For best results, all the requirements of Virtual SAN should be met in a production environment.
Virtual SAN requirements for hybrid configurations:
1 GB NIC (dedicated) minimum, 10 GB NIC (shared) recommended.
A VMkernel port configured on each network that VSAN traffic will be replicated.
At least 6 GB of RAM per host, 10 GB when using seven or more disks.
SATA/SAS HBA or RAID controller.
At least 1 SSD in each host for hybrid configurations.
Recommended that SSD storage is at least 10% of the total storage in capacity.
A minimum of three hosts in a Virtual SAN cluster with storage disks; four is recommended.
All Flash configurations with fast durable and slow and capacity require VSAN 6.0.
Virtual SAN clusters can include hosts with storage disks, or without. The minimum requirement is three hosts with storage disks.
Minimum version of vSphere: 5.5. Recommended...