We installed a new host on our infrastructure. The specifications of the other hosts are as follow:

Super Micro
Intel Xeon CPU
E5620 @2.4Ghz

Super Micro
Intel Xeon CPU
E5606 @2.13Ghz

Super Micro
Intel Xeon CPU
E5645 @2.4Ghz

Intel Core i7
950 @3.07Ghz

The new host's specifications look like this:

Dell PowerEdge R900
Intel Xeon CPU
X7350 @2.93Ghz

After the new host was installed, I was not able to migrate a VM from another host. The virtual machine requires hardware features that are unsupported or disabled on the target host

We can see this processor belongs to the Tigerton generation. However, EVC does not have Tigerton listed under the generations.

My questions are the following:

  1. Can a generation on EVC mess with our current infrastructure and affect our VM's?
  2. Which generation will work for Tigerton? And if it does not work, what are the risks for my other VM's?

1 Answer 1

  1. In case the software inside your VMs relies on a CPU feature that the chosen EVC mode hides it will crash. A lot of software doesn't take some CPU features for granted and falls back to doing things themselves ("in software") instead of offloading tasks to specialized CPU instructions. So even if your software can run without certain CPU features you might face a serious performance impact when you hide CPU features through EVC.

  2. According to this EVC "Merom" should be the correct one for Tigerton.

  • Your answer corresponds with an answer I received on vmware communities. It comes down to a point where you should rather not enable EVC for older esxi hosts, but only if you install a very new host and really need it. communities.vmware.com/message/2520801#2520801
    – Rudolph
    Jul 6, 2015 at 6:20
  • We eventually swapped the Dell PowerEdge R900 for a better and newer server in the same generation.
    – Rudolph
    Jan 8, 2016 at 12:49

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