Cisco Unity Connection

CUC/CUCM vCPU Mismatch can cause Upgrade Failure

Document ID: 117555

Updated: Mar 28, 2014

Contributed by Anirudh Mavilakandy, Cisco TAC Engineer.



This document describes the procedure to correct the Unsupported Hardware error issue.

Upgrades on Cisco Unity Connection (CUC) / Cisco Unified Communications Manager (CUCM) fail with an 'Unsupported Hardware' error. This is because of  the vCPU (Virtual CPU) mismatch seen on the Virtual Machine(VM) properties (vSphere Client - This is the value that is set correctly) and seen on CUC / CUCM via CLI.



Cisco recommends that you have knowledge of these topics:

  • Cisco Unity Connection
  • Cisco Unified Communications Manager
  • Virtual Machines

Components Used

The information in this document is based on these software versions:

  • Cisco Unity Connection Release 8.X or later
  • Cisco Unified Communications Manager Release 8.X or later

The information in this document is created from the devices in a specific lab environment. All of the devices used in this document is started with a clear (default) configuration. If the network is live, make sure that you understand the potential impact of any command.


Upgrade fails with this error:

05/31/2013 21:40:18|File:/common/download/,
Function: validate_upgrade_allowed(), This server is not supported for use with the version of "connection" that you are trying to install.

 The actual value for vCPU while you create the VM is shown here:


Here the VM is created with one vCPU. However to log into the CUC/CUCM CLI displays a different value for vCPU, "show hardware" also displays 8 vCPU.



By default, Hot Plug (add vCPU) for VMs is in the disabled state. Check to see if this is in enabled state. The enablment of this feature allows the VMs to access more resources if required.

In order to disable the Hot Plug (add vCPU), shut down the VM. This parameter cannot be modified while the VM is in execution.

  • Open the VMs properties, choose Options > Memory/CPU Hotplug in the Advanced section.
  • In the right-hand side of the window, note that there are two sections - one for memory and one for CPU. Click the "Disable CPU hot plug for this virtual machine" radio button.


Updated: Mar 28, 2014
Document ID: 117555