HCX - IX/NE appliance CPU reservation may fail

Products

• VMware HCX

Issue/Introduction

To identify a known issue when a large CPU reservation value is applied to an HCX appliance VM.

Setting the HCX IX/NE appliance VM CPU reservation within the HCX manager Compute Profile UI may result in a reservation request failure

This occurs when a large reservation value such as 95% or greater is applied due to a lack of available CPU resource on the ESXi host that the appliance resides on

 

Environment

VMware HCX

Cause

The max CPU reservation value that the HCX manager is using in its reservation calculation does not take into account the 2-3GHZ reserved for Kernel by the ESXi host. This may result in a CPU reservation failure due to a lack of CPU resources on the ESXi host to fulfill the request.

Resolution

None

Workaround:

Reduce the CPU reservation until the task succeeds.

 

Additional Information

Impact/Risks:
The CPU reservation workflow may fail.