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Enhanced VMotion Compatibility (EVC) processor
support
Details
Enhanced VMotion Compatibility (EVC) simplifies VMotion compatibility issues across CPU
generations. EVC automatically configures server CPUs with Intel FlexMigration or AMD-V
Extended Migration technologies to be compatible with older servers.
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After EVC is enabled for a cluster in the VirtualCenter inventory, all hosts in that cluster are
configured to present identical CPU features and ensure CPU compatibility for VMotion. The
features presented by each host are determined by selecting a predefined EVC baseline.
VirtualCenter does not permit the addition of hosts that cannot be automatically configured to
be compatible with the EVC baseline.
Solution
To use EVC, you must be running ESX 3.5 Update 2 or higher with VirtualCenter 2.5 Update
2 or higher and have compatible processors in your servers. EVC does not allow for migration
with VMotion between Intel and AMD processors.
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Note:&To search for supported EVC CPU types,&see the charts below or refer to
the&WebHCL&and search by EVC Modes.
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Note the following restrictions:
1. VMware cannot verify whether all processor models listed are capable of EVC
support. For more information on supported servers and processors models, see
the&Systems Compatibility Guide&for your ESX version.
2. Verify the BIOS settings for these processors enable Hardware Virtualization (if
available) and Execute Protection. Default BIOS settings may not always enable
these features. Hardware Virtualization is&Intel&VT on Intel processors and AMD-V
on (supported) AMD processors. Execute Protection is Intel eXecute Disable (XD)
on Intel processors and AMD No eXecute (NX) on AMD processors.&Until these
CPU features are enabled, ESX hosts with EVC supported CPU types listed below
will be unsupported.
EVC capabilities of your server are based on two factors:
1. The version of vCenter Server that manages the host.
2. The underlying CPU architecture of the host processor.
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