Understanding VMware EVC
Many people are confused about VMware EVC and how to configure this on their systems. When most people go to configure EVC they attempt to turn it on and get this hardware does not support EVC. Which is untrue for 98% of the attempts. There is more to enabling EVC than many realize.
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A few refinements for the AMD side
The AMD equivalent to Intel-VT is AMD-V but you do not need to have it enabled for EVC. We have an EVC cluster of HP DL585 proliant G1/G2/G5 servers and AMD-V is not an option on a G1. If you turn it on for G2 and G5 then you introduce CPU incompatibility with the G1 and VMotion fails.Happily the CPU mask default for G1 instructions matches the EVC cluster mask so we can just VMotion VMs that are running outside the EVC cluster on G1 servers directly into the EVC cluster.
Unfortunately the same is not true for G2 or G5 and you cannot change the mask in virtual center anymore since VC2.5u2 while the VM is running. Cold migrations are the answer so far.
EVC is a good step forward in compatibility, even if the transition is a little rough in spots.
Thank you for the article and your ESX book and other articles.
EVC processor support
VMware has a KB article listed the processors that are supported with EVC. The URL is http://kb.vmware.com/kb/1003212.EVC is an interesting
EVC is an interesting features and I would like to share how to enable EVC on ESX 3.5 with NO Downtime wrote sometimes ago http://malaysiavm.com/blog/how-to-enable-evc-on-esx-35/replica bags
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