Sun Microsystems 3.0.0 Known limitations, Following Guest SMP multiprocessor limitations exist

13 Known limitations

The following section describes some issues that are known not to work in VirtualBox 3.0.0. Unless marked otherwise these issues are planned to be fixed in later releases.

•The following Guest SMP (multiprocessor) limitations exist:

–Bad performance with 32-bit guests on AMD CPUs. This affects mainly Windows and Solaris guests, but possibly also some Linux kernel revisions.

–64-bit guests on 32-bit hosts do not support SMP yet (except on Mac OS X).

•64-bit guests on some 32-bit host systems with VT-x can cause instabilities to your system. If you experience this, do not attempt to execute 64-bit guests. Refer to the VirtualBox user forum for additional information.

•Direct 3D support in Windows guests. For this to work, the Guest Additions must be installed in Windows “safe mode”. Press F8 when the Windows guest is booting and select “Safe mode”, then install the Guest Additions. Otherwise Windows’ file protection mechanism will interfere with the replacement DLLs installed by VirtualBox and keep restoring the original Windows system DLLs.

•Shrinking virtual disk images is limited to VDI files. The VBoxManage modifyhd -compact command is currently only implemented for VDI files. At the moment the only way to optimize the size of a virtual disk images in other formats (VMDK, VHD) is to clone the image and then use the cloned image in the VM configuration.

•OVF import/export:

–Some virtual machine properties supported by VirtualBox’s own XML file format are not exported. As a result, when exporting and then re-importing a virtual machine with VirtualBox, the settings need not be identical. This is especially true for the I/O APIC setting, 3D acceleration, hardware virtu- alization, nested paging and other VM properties.

–OVF localization (multiple languages in one OVF file) is not yet supported.

–Some OVF sections like StartupSection, DeploymentOptionSection and In- stallSection are ignored.

–OVF environment documents, including their property sections and appli- ance configuration with ISO images, are not yet supported.

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