Network Router User Manual

12 Change log

This section summarizes the changes between VirtualBox versions. Note that this

change log is not exhaustive; not all changes are listed.

VirtualBox version numbers consist of three numbers separated by dots where the

ﬁrst number represents the major version, the 2nd number the minor version and the

3rd one the build number. Build numbers of ofﬁcial releases are always even. An odd

build number represents an internal development or test build.

12.1 Version 3.1.0 Beta 2 (2009-11-19)

This version is a major update. The following major new features were added:

• Teleportation (aka live migration); migrate a live VM session from one machine

to another

• VM states can now be restored from arbitrary snapshots instead of only the last

one, and new snapshots can be taken from other snapshots as well (“branched

snapshots”; see chapter 1.8, Snapshots, page 25)

• 2D video acceleration for Windows guests; use the host video hardware for over-

lay stretching and colour conversion (see chapter 4.10, Hardware 2D video accel-

eration for Windows guests, page 73)

• More ﬂexible storage attachments: CD/DVD drives can be attached to arbitrary

storage controllers, and there can be more than one such drive (chapter 5, Virtual

storage, page 76)

• Support for Parallels version 2 disk image (HDD) ﬁles; see chapter 5.2, Disk

image ﬁles (VDI, VMDK, VHD, HDD), page 79

• The network attachment type can be changed while a VM is running

• Experimental USB support for OpenSolaris hosts making use of the latest USB

enhancements in Solaris Nevada 124 and higher

• Signiﬁcant performance improvements for PAE and AMD64 guests (VT-x and

AMD-V only; normal (non-nested) paging)

• Experimental support for EFI (Extensible Firmware Interface; see chapter 3.12,

Alternative ﬁrmware (EFI), page 58)

167