The CPU hot plug option lets you add or remove CPU resources for a virtual machine while the machine is powered on.

When you configure multicore virtual CPUs for a virtual machine, CPU hot Plug is disabled.

Adding CPU resources to a running virtual machine (with CPU hot plug enabled) disconnects and reconnects all USB passthrough devices connected to that virtual machine.

Verify that the virtual machine is running under the following conditions:

VMware Tools is installed (required for hot plug functionality with Linux guest operating systems).

The virtual machine has a guest operating system that supports CPU hot plug.

The virtual machine is using hardware version 7 or later.

CPU hot plug is enabled on the Options tab of the Virtual Machine Properties dialog box.

1

In the vSphere Client inventory, right-click the virtual machine and select Edit Settings.

2

Click the Options tab and under Advanced, select Memory/CPU Hotplug.

3

Change the CPU Hot Plug setting.

Disable CPU hot plug for this virtual machine

Enable CPU hot add only for this virtual machine

Enable CPU hot add and remove for this virtual machine

4

Click OK to save your changes and close the dialog box.