Article ID: 118255, created on Oct 28, 2013, last review on May 10, 2014

  • Applies to:
  • Virtuozzo hypervisor

Symptoms

Virtual machine cannot be started with the following error message:

[root@psbmnode ~]# prlctl start MyVM
Starting the VM...
Failed to start the VM: Failed to load virtual machine monitor. Parallels Server cannot load the virtual machine monitor due to internal incoherence. Please contact the Parallels support team for assistance.

Cause

Intel Virtualization Technology (Intel VT-x) hardware extension is disabled in BIOS

Resolution

Enable Intel VT-x in BIOS:

  • Reboot the computer and open the system's BIOS menu. (This can usually be done by pressing the delete key, the F1 key or Alt and F4 keys depending on the system.)

  • Enabling the virtualization extensions in BIOS

    Note: Many of the steps below may vary depending on your motherboard, processor type, chipset and OEM. Refer to your system's accompanying documentation for the correct information on configuring your system.

    • Open the Processor submenu. The processor settings menu may be located in the Chipset, Advanced CPU Configuration or Northbridge.
    • Enable Intel Virtualization Technology (also known as Intel VT-x). AMD-V extensions cannot be disabled in the BIOS and should already be enabled. The virtualization extensions may be labeled Virtualization Extensions, Vanderpool or various other names depending on the OEM and system BIOS.
    • Enable Intel VT-d or AMD IOMMU, if the options are available. Intel VT-d and AMD IOMMU are used for PCI device assignment.
    • Select Save & Exit.
  • Reboot the machine.

  • When the machine has booted, run the following command to ensure that there is some output:

    ~# cat /proc/cpuinfo | grep -E "vmx|svm"
    

If there is no output still, please refer to CPU specifications.

Search Words

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