Error "The number of cores per socket can only be changed for the virtual machine when powered off" when attempting to modify vCPUs for a virtual machine in Cloud Director

Products

• VMware Cloud Director

Issue/Introduction

• Unable to increase Cores per socket on the virtual machine in Cloud Director.
• Although CPU hot-add is enabled, attempt to modify the Cores per socket configuration fails with the error:

The number of cores per socket can only be changed for the virtual machine when powered off.

Environment

Cloud Director 10.x

Cause

Enabling CPU hot-add only allows increasing the vCPU count for a Powered-On VM. 

Changing the "Cores per socket" value is not supported while the VM is operational. A VM power-off is required for hardware re-initialization.

Resolution

Cores Per Socket can only be changed when the VM is Powered-Off.

Steps:

1) Power Off the VM:

• • Log into the Guest OS to initiate a shutdown. 
  • Alternatively, use the Actions > Power > Shut Down option within the Cloud Director tenant portal.

2) Edit VM Configuration:

• • Navigate to Data Centers > Compute > Virtual Machines.
  • Select the specific VM and click Details.
  • Under the Hardware section, select Compute, click Edit, and adjust the Cores Per Socket value.
  • Click Save to apply.

3) Power-On the VM:

• • Power-On the virtual machine to initialize the new hardware settings.