henry_wang
Enthusiast
Enthusiast

How to configure EVC Mode on VMware Cluster

Jump to solution

Have three ESXI Server (5.1) 

Host1  CPU: Intel E-2665

Host2  CPU: Intel E-2680

Host3  CPU: Intel E5645

3 Hosts have different CPU, I'm not sure how to config EVC MODE on VMware Vcenter Cluster.

1 Solution

Accepted Solutions
SavkoorSuhas
Expert
Expert

Hello,

I believe you mean to say host 1 and host 2 has E5-2665 and E5-2680 respectively. Then, these belong to the SandyBridge family. Host 3 E5645 belongs to Westmere family.

Intel CPU EVC Matrix (VMware Enhanced vMotion Compatibility) | Virten.net

The EVC CPU family goes in the order (lowest to highest) - Merom, Penryn, Nehalem, Westmere, SandyBridge, IvyBridge, Haswell and so On.

In our case, the lowest we have is Westmere and the highest is Sandybridge.

While enabling EVC it will ask you to set a baseline. The baseline that has to be chosen is the lowest CPU family in the cluster. The lowest CPU family in our cluster is Westmere, so the EVC baseline to be set is Westmere.

However, there is a rule in EVC:

While enabling EVC on the cluster, any host having a CPU family that is higher than the baseline being set, then the VMs on that host has to be powered OFF while enabling EVC.

What this tells is, the virtual machines running on SandyBridge host has to be Powered OFF first, enable the EVC with Westmere baseline, and then Power ON the VMs on the SandyBridge host. The VMs on the Westmere host can stay powered ON during this operation.

This is because, the SandyBridge host has higher CPU features which will be masked by EVC to create a homogeneous CPU across the cluster. Masking a CPU feature when a VM is Powered ON is not recommended as the VM is actively using that feature.

So the steps to be followed:

1. Power OFF the VMs on the SandyBridge host.

2. Right Click the Cluster > Edit Settings > VMware EVC > Change

3. Enable EVC for Intel hosts and from the Baseline drop-down select Intel Westmere. Click OK

4. Power ON the VMs on Sandybridge host.

5. Perform a vMotion to test EVC.

Suhas

If you found this or any other answer useful please consider the use of the Helpful or Correct buttons to award points. Don't Backup. Go Forward! Rubrik Peek into my Website: http://www.virtuallypeculiar.com

View solution in original post

4 Replies
SavkoorSuhas
Expert
Expert

Hello,

I believe you mean to say host 1 and host 2 has E5-2665 and E5-2680 respectively. Then, these belong to the SandyBridge family. Host 3 E5645 belongs to Westmere family.

Intel CPU EVC Matrix (VMware Enhanced vMotion Compatibility) | Virten.net

The EVC CPU family goes in the order (lowest to highest) - Merom, Penryn, Nehalem, Westmere, SandyBridge, IvyBridge, Haswell and so On.

In our case, the lowest we have is Westmere and the highest is Sandybridge.

While enabling EVC it will ask you to set a baseline. The baseline that has to be chosen is the lowest CPU family in the cluster. The lowest CPU family in our cluster is Westmere, so the EVC baseline to be set is Westmere.

However, there is a rule in EVC:

While enabling EVC on the cluster, any host having a CPU family that is higher than the baseline being set, then the VMs on that host has to be powered OFF while enabling EVC.

What this tells is, the virtual machines running on SandyBridge host has to be Powered OFF first, enable the EVC with Westmere baseline, and then Power ON the VMs on the SandyBridge host. The VMs on the Westmere host can stay powered ON during this operation.

This is because, the SandyBridge host has higher CPU features which will be masked by EVC to create a homogeneous CPU across the cluster. Masking a CPU feature when a VM is Powered ON is not recommended as the VM is actively using that feature.

So the steps to be followed:

1. Power OFF the VMs on the SandyBridge host.

2. Right Click the Cluster > Edit Settings > VMware EVC > Change

3. Enable EVC for Intel hosts and from the Baseline drop-down select Intel Westmere. Click OK

4. Power ON the VMs on Sandybridge host.

5. Perform a vMotion to test EVC.

Suhas

If you found this or any other answer useful please consider the use of the Helpful or Correct buttons to award points. Don't Backup. Go Forward! Rubrik Peek into my Website: http://www.virtuallypeculiar.com

View solution in original post

linotelera
Hot Shot
Hot Shot

Hi

Check this KB: http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=100321...

...and compatibilty matrix: VMware Compatibility Guide: cpu

Based on your informations seems you can use Westmere or Nehalem...

pastedImage_2.png

henry_wang
Enthusiast
Enthusiast

Hello:

Thanks for your detailed answer,and I understand the EVC Mode. thanks very much.

0 Kudos
henry_wang
Enthusiast
Enthusiast

Thanks very much! It's very usefull.

0 Kudos