decide evc mode for two cluster properly?

[niceguy001]

i had noticed the article such as VMware Knowledge Base

and trying to rebuild a new infrastructure with version 6.5U1 (ESXi and vcenter)

there will be two clusters(two servers)

the cluster A uses intel cpu xeon E5-26xx v3

and another cluster B uses intel cpu xeon gold 5120

i would like to migrate the powered on VMs between these clusters

and I set cluster A into haswell mode and cluster B with broadwell mode

the powered on VMs in cluster A can be migrate to cluster B with no problems

but...VMs in cluster B just unable to migrate to cluster A and showing the error messages:

"The target host does not support the virtual machine's current hardware requirements.

To resolve CPU incompatibilities, use a cluster with Enhanced vMotion Compatibility (EVC) enabled. See KB article 1003212

3DNow! PREFETCH and PREFETCHW are unsupported."

the EVC mode i set for these two clusters should be the only mode which is correct for them.

can anyone give some suggestions?

[daphnissov · Accepted solution]

You can't have one cluster set higher than the other and still migrate VMs between them. There is, at best, a 2-year gap between those CPU generations. So if you want to migrate between both, set your Cluster A to the highest EVC mode possible and set Cluster B to match that mode (i.e., both to Haswell). Otherwise you expose features to the VMs in Cluster B that cannot be matched in Cluster A, hence why you see that error message.