VMware Cloud Foundation - Design Decision - When using a single availability zone, configure admission control for 1 ESXi host failure and percentage- based failover capacity.

Products

• VMware
• VMware Cloud Foundation

Issue/Introduction

Design Decision: When using a single availability zone, configure admission control for 1 ESXi host failure and percentage- based failover capacity.

Resolution

Design Justification: Using the percentage-based reservation works well in situations where virtual machines have varying and sometimes significant CPU or memory reservations.

vSphere automatically calculates the reserved percentage according to the number of ESXi host failures to tolerate and the number of ESXi hosts in the cluster.

Design Implication: In a cluster of 4 ESXi hosts, only the resources of 3 ESXi hosts are available for use.

This design decision is supported in the following Domains. 
•    Management Domain
•    VI Workload Domain

This design decision is supported on VCF version 4.1 and higher. 

Note: To search for additional information on this design decision please search on the design decision text in https://docs.vmware.com/. For example https://docs.vmware.com/en/search/#/%22Enable%20Network%20I%2FO%20Control%20on%20all%20distributed%20switches.%22

Additional Information

Please reference the VMware Cloud Foundation version you are running and if this design decision is applicable to you. 

VMware Validated Design (VVD) Bill of Materials