Home > Integrated Products > VxRail > Guides > Planning Guide—VMware Cloud Foundation 5.1 on VxRail > Sizing the Cloud Foundation domains
The best practice for the resource sizing effort of the Cloud Foundation domains is to consider an initial baseline of resources required for overall management based on use cases, and then calculate the additional resources needed for guest virtual machines.
Dell Technologies uses a sizing tool to calculate the workload resource requirements for the Cloud Foundation domains. Dell Technologies will conduct a sizing exercise to determine the pools of resources required to satisfy VI workload domain demands and their service level objectives at an optimal cost.