What's New in Windows HPC Server 2008

All of the command-line tools in Windows Compute Cluster Server 2003 (such as Cluscfg for configuration, and Clusrun for running commands remotely on one or more nodes) are still included.
Windows HPC Server 2008 provides API-level compatibility for applications integrated with Windows Compute Cluster Server 2003. These applications might, however, require changes to run on Windows Server® 2008. If you encounter problems running your application on Windows Server 2008, you should consult your software vendor.
Windows HPC Server 2008 supports job submission from Windows Compute Cluster Server 2003 clients, including the command-line tools, the Compute Cluster Job Manager, and the COM APIs.
The Windows HPC Server 2008 client tools, including the cluster administration console (HPC Cluster Manager), the job scheduling console (HPC Job Manager), the command-line tools, and the APIs cannot be used to manage or submit jobs to a Windows Compute Cluster Server 2003 cluster.
Clusters that have Windows Compute Cluster Server 2003 nodes and Windows HPC Server 2008 nodes are not supported.

A side-by-side installation of Windows HPC Server 2008 and Windows Compute Cluster Server 2003 on the same computer is not supported. This includes the Windows HPC Server 2008 client utilities.
The upgrade of a Windows Compute Cluster Server 2003 head node to a Windows HPC Server 2008 head node is not supported.
The installation of HPC Pack 2008 adds the following server roles to the head node:
- DHCP
- Windows Deployment Services
- File Services
- Network Policy and Access Services, which enables Routing and Remote Access so that NAT services can be provided to the cluster nodes.