How to enable the EVC Mode in the Cluster?

This post is about enabling the EVC Mode in the cluster?

Here is the scenario, we had an issue reported on one of the ESX host where Memory module is bad and has to be get it replaced. I have logged the call with HP and HP technician has reached our datacenter and has replaced the faulty memory module on one of our ESX Server. This ESX is part of one of the ESX cluster which has enabled with the EVC Mode.

After the ESX Memory module was replaced the HP Technician has left the datacenter after doing his diagnostics and the amber lights were also disappeared which was earlier shown in errors.

Now after the Memory replacement the ESX server was Powered ON and the server is exited from the Maintenance Mode BUT I was unable to turn ON the EVC Mode for this ESX host.

On or more ESX Hosts reports the following

EVC Cannot be enabled because one or more hosts in the cluster do not support EVC
EVC Cannot be enabled because not all virtual machines in the cluster are powered off

Incompatible hardware
ESX Server upgrade required for EVC support


The VMware KB article suggests that for enabling the EVC Mode we have to enable the following.
1) Intel/AMD Virtualization Technology
2) No-Execute Memory Protection

The KB article has given me a clue which was related to the Memory. I have reconfirmed intel-vt in the BIOS and also checked No-Execute Memory Protection in BIOS. Since the memory has been changed the No-Execute Memory Protection in Disabled Mode.

The following screen shot shows the Intel Virtualization Technology and No-Execute Memory Protection options in BIOS.

I have enabled the No-Execute Memory Protection in BIOS and enabled then enabled the EVC Mode in vcenter server. This has fixed my issue with the EVC Mode.

How to enter into BIOS on HP Proliant Servers??

Power ON the server and then hit the following Functional Keys to enter into the Specific Modes..

F8 – Boot Menu
F10 – Setup Menu
F12 – Network Boot
ESC – Summary and Boot Progress

For More info Please refer to the following KB articles:

Thanks for reading 🙂

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