Howtoforge posted a guide about installing Linux Integration Services v2.1 Hyper-V R2 on CentOS 5

When installed on a virtual machine that is running a supported Linux operating system, Linux Integration Services for Hyper-V provides the following functionality: - Driver support for synthetic devices: Linux Integration Services supports the synthetic network controller and the synthetic storage controller that were developed specifically for Hyper-V. - Fastpath Boot Support for Hyper-V: Boot devices now take advantage of the block Virtualization Service Client (VSC) to provide enhanced performance. - Timesync: The clock inside the virtual machine will remain synchronized with the clock on the host. - Integrated Shutdown: Virtual machines running Linux can be shut down from either Hyper-V Manager or System Center Virtual Machine Manager, using the "Shut Down" command. - Symmetric Multi-Processing (SMP) Support: Supported Linux distributions can use up to 4 virtual processors (VP) per virtual machine.

  Installing Linux Integration Services v2.1 Hyper-V R2 On CentOS 5