The EVC mode of a virtual machine determines the CPU features that a host must have in order for the virtual machine to power on and migrate. The EVC mode of a virtual machine is determined when the virtual machine is powered on. In vSphere 6.7, the EVC mode of a virtual machine is independent from the EVC mode that you configure for the cluster in which the virtual machine runs.

The EVC mode of a virtual machine is determined when the virtual machine is powered on. At power-on, the virtual machine also determines the EVC mode of the cluster in which it is running. If the EVC mode of a running virtual machine or the entire EVC cluster is raised, the virtual machine does not change its EVC mode until it is powered off and powered on again. This means that the virtual machine does not use any CPU features exposed by the new EVC mode until the virtual machine is powered off and powered on again.

For example, consider a cluster that contains hosts with Intel Xeon 45 nm Core two processors that are set to the Intel Merom Generation (Xeon Core 2) EVC mode. When you power on a virtual machine in this cluster, it runs in the Intel Merom Generation (Xeon Core 2) EVC mode. If the EVC mode of the cluster is raised to Intel Penryn Generation (Xeon 45 nm Core 2), the virtual machine remains at the lower Intel Merom Generation (Xeon Core 2) EVC mode. To use any of the features exposed by the higher cluster EVC mode, such as SSE4.1, you must power off the virtual machine and power it on again.

Procedure

  1. In the vSphere Client, select a cluster or a host in the inventory.
  2. Click the VMs tab.

    A list of all virtual machines in the selected cluster or on the selected host appears.

  3. If the EVC Mode column does not appear, click the arrow in any column title, select Show/Hide Columns, and select the EVC Mode check box.

    The EVC Mode column shows the EVC modes of all virtual machines in the cluster or on the host.

    Important:

    The EVC Mode column displays the EVC mode defined at the virtual machine level. However, if you do not configure per-VM EVC for a virtual machine, the virtual machine inherits the EVC mode of its parent cluster or host. As a result, for all virtual machines that do not have per-VM EVC configured, the EVC Mode column displays the inherited cluster-based EVC mode.

    Important:

    If the virtual machine is running in an EVC cluster, its EVC mode is determined in the following manner.

    Per-VM EVC

    Cluster-level EVC

    EVC Mode for the Virtual Machine

    Enabled

    Enabled

    Enabled. The EVC Mode column displays the EVC mode of the virtual machine.

    Disabled

    Enabled

    Enabled. The EVC Mode column displays the EVC mode of the EVC cluster.

    If a virtual machine is powered off and is in an EVC cluster, theEVC Mode column always displays the per-VM EVC mode.