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Virtual Box Question

  • 11-11-2010 12:02pm
    #1
    FSL
    Registered Users, Registered Users 2 Posts: 1,456 ✭✭✭


    I have a multi boot system I installed virtual box on XP Pro SP3 and Fedora 12.
    It is an AMD dual core 64 bit processor with 4GB of memory

    Running Virtual Box on XP I installed Windows 7 Ultimate 64 bit. On Fedora I installed Fedora 14 X64.

    The two vdi files (W7 and F14) reside on a different partition to the OS's and both are visible on both OS's.

    Using Virtual box on Fedora I can start both virtual clients but the Windows 7 client says the hardware has changed and must be reactivated by telephone.

    Using Virtual Box on XP Pro I can start the Windows 7 machine which is a 64 bit operating system, which recognises it has been activated, but not the Fedora14 machine. Trying to start Fedora14 I get a message saying the system is x64 and it can only find i686.

    Questions are:-
    Why will VBox start a Widows 64 bit operating system from a 32 bit Host OS but not a Linux 64 bit operating system.

    Why does the Windows 7 client, when running on a Linux 64bit host think the hardware has changed from when the same client is running on a Windows 32bit host.

    It is not the end of the world, but i am just curious as to why a virtual clients can behave differently on different hosts on the same physical machine.


    Any ideas or suggestions would be appreciated.


Comments

  • #2
    jpl888
    Closed Accounts Posts: 407 ✭✭jpl888


    AFAIK as long as the host processor has hardware virtualisation extensions you should be able to run 64 bit guest on 32 bit or 64 bit host, although I think the feature is relatively new.

    Perhaps you could try different versions of VirtualBox to see if that makes any difference i.e. the one included with Fedora, the OSE version from the VirtualBox website and the PUEL version.

    You could also run a 32 bit guest in Fedora and check the CPU usage. If it is high it probably indicates that VBox is not detecting the CPU extensions and thus why the 64bit guest won't work in Fedora.


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