Architecting VMware vSAN 6.2 : vSAN Design Overview : 5.6 vSAN Requirements : 5.6.1 vSphere Requirements : 5.6.1.2 Host CPU Overhead
   
5.6.1.2 Host CPU Overhead
vSAN does not have specific CPU requirements because it introduces a less than 10 percent CPU overhead. This might impact available resources in high consolidation ratio workloads and CPU-intensive applications. Therefore, when designing and sizing the environment, take the projected resource requirements for the environment into account so that performance does not suffer due to a lack of resources or the overcommitment of available resources.