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Troubleshooting host architecture incompatibility (1003747)

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  • Cannot power on a virtual machine.
  • Unable to use a 64-bit guest operating system.
  • Cannot use desired number of virtual CPUs.
  • Guest operating system behaves unexpectedly.
  • This error message appears:
    • Your host's BIOS does not have valid NUMA information. Please update the host's BIOS or associate the virtual machine with the processors in a single NUMA node (CEC).

add-vcpu boot-guest-os cannot-boot-vm cannot-edit-vcpu guest-os-crash installing-64bit-vm-fails migrate-vm slow-guest-os-performance use-64bit-os vmotion-vm


This article assists you in determining if there is an incompatibility between the configuration of a virtual machine, its guest operating system, and the software and hardware of its host computer. These incompatibilities may occur during the creation of a virtual machine or after a virtual machine has been migrated from one host to another. Problems include being unable to power on a virtual machine, not being able to use a 64bit guest operating system, not being able to use the desired number of virtual CPUs, and unexpected guest operating system behavior.


To rule out any incompatibility between a virtual machine and its host computer:
  1. Verify that the guest operating system installed on the virtual machine is supported by the version of VMware product being used. For more information, see

    Note: Also check to see if the operating system settings of the virtual machine match the guest operating system installed.

  2. Verify that the virtual machine has not been configured to have more virtual CPUs than are available on the host computer.

  3. Verify that the current host CPU architecture (Intel or AMD) matches that of the host CPU architecture on which the virtual machine was originally created.

    Note: Certain distributions and versions of Linux guest operating system kernels may experience problems if the virtual machine is being powered on by a host with a different CPU architecture.

  4. Verify that all virtual devices in use by the virtual machine are supported by the host computer and by the VMware product being used.

    Note: Refer to the manual for your host computer, its operating system, and for the VMware product that you are using.

  5. If you are trying to get your virtual machine to run a 64bit guest operating system:
    1. Confirm that your host hardware supports this. For more information, see Hardware and Firmware Requirements for 64-Bit Guest Operating Systems (1003945).

    2. If your host is using one or more Intel processors, verify that virtualization technology (VT) is enabled in its BIOS. For more information, see Ensuring virtualization technology (VT) is enabled on your VMware host (1003944).

  6. If the guest operating system of your virtual machine does not support paravirtualization, confirm that the virtual machine does not have this setting enabled:

    Note: Only newer 32-bit Linux guest operating system kernels support paravirtualization.

    Note: This is a setting that is only available with ESX 3.5.x and Workstation 6.0.x virtual machines.

    For ESX Server 3.5.x:

    1. With the Virtual Infrastructure Client (VI Client) connect to the ESX host that is managing the virtual machine or to VirtualCenter.
    2. If the virtual machine is powered on, power it off.
    3. Right-click the entry for the virtual machine.
    4. Click Edit Settings.
    5. Click the Options tab.
    6. Click Paravirtualization.
    7. If it is enabled, click Support VMI Paravirtualization.

    For Workstation 6.0.x:

    1. If the virtual machine is powered on, power it off.
    2. Click the entry for the virtual machine from the VMware application window.
    3. Click Edit virtual machine settings.
    4. Click the Options tab.
    5. Click Advanced.
    6. If it is enabled, click Enable VMware paravirtual kernel support.

Update History

06/10/11 - changed 6.x to 6.0.x as this feature is not available in 6.5 - kadamson

Request a Product Feature

To request a new product feature or to provide feedback on a VMware product, please visit the Request a Product Feature page.


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