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For example, consider a cluster containing hosts with Intel Xeon 45nm Core™ 2 processors that have been
set to the Intel
®
"Merom" Generation (Xeon
®
Core™ 2) EVC mode. A virtual machine powered on in this
cluster runs in the Intel "Merom" Generation (Xeon Core 2) EVC mode. If the cluster's EVC mode is raised to
Intel "Penryn" Generation (Xeon 45nm 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.
You can use the Virtual Machines tab of a cluster or a host to determine the EVC modes of the running
virtual machines.
Prerequisites
n
You must be connected to a vCenter Server system with the vSphere Client.
Procedure
1 Select the cluster or host in the inventory.
2 Click the Virtual Machines tab.
3 If the EVC Mode column is not displayed, right-click on the column titles and select EVC Mode.
The EVC modes of all running or suspended virtual machines are displayed in the EVC Mode column.
Powered off virtual machines and virtual machines that are not in EVC clusters show N/A as the EVC
mode.
Prepare Clusters for AMD Processors Without 3DNow!
Newer generations of AMD processors do not include 3DNow! processor instructions. If hosts in a cluster
have different generations of AMD processors, some with 3DNow! instruction sets and some without, you
cannot successfully migrate virtual machines between the hosts. You must use an EVC mode or CPU
compatibility mask to hide the instructions.
The vCenter Server AMD Opteron Gen. 3 (no 3DNow!) EVC mode masks the 3DNow! instructions from
virtual machines. You can apply this EVC mode to EVC clusters containing only AMD Opteron Generation
3 hosts to allow the clusters to maintain vMotion compatibility with AMD Opteron hosts that do not have
3DNow! instructions. Clusters containing AMD Opteron Generation 1 or AMD Opteron Generation 2 hosts
cannot be made vMotion-compatible with hosts that do not have 3DNow! instructions.
Prerequisites
n
You must be connected to a vCenter Server system with the vSphere Client.
n
Ensure that the cluster contains only hosts with AMD Opteron Generation 3 or newer processors.
Chapter 13 Migrating Virtual Machines in the vSphere Client
VMware, Inc. 131