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Posts Tagged ‘vMotion’

VMware: After upgrade to ESX 4.0 Host is incompatible with the virtual machine’s requirements

July 28th, 2009 Daniel Buonocore No comments

After we update ESX3.5 to ESX4.00 we noticed that some vms would not vmotion to a different host. Every time we tried we got the following error message.

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VMware: VMotion CPU Compatibility Requirements for Intel Processors (1991)

June 8th, 2009 Daniel Buonocore No comments

Why am I unable to migrate virtual machines with VMotion across Intel processors?

In ESX 3.5 Update 2 and later, VMware recommends using Enhanced VMotion Compatibility (EVC) to eliminate many VMotion CPU compatibility problems. For more information on EVC, see KB 1003212.
 
To ensure system stability during migration with VMotion, VirtualCenter and vCenter Server require the source and target CPUs to be compatible. For more information on CPU compatibility requirements, see Basic System Administration for your version of VirtualCenter or vCenter Server, available from http://www.vmware.com/support/pubs/.

If the source and target CPUs are incompatible for VMotion, you can:

  • Perform a cold migration (rather than a VMotion migration), thereby removing VMotion CPU requirements as an issue.
  • Remove VMotion compatibility constraints by modifying the default bit-mask used by VirtualCenter or vCenter Server. Note that some modifications discussed in this knowledge base article are neither supported nor recommended by VMware for production environments. In general, masking any CPU features intended for applications (such as SSE3) is not supported for VMotion. Use of EVC is recommended for migrating virtual machines across CPU generations.

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