Released Hyper-V updates (up till September)
Since the release of Hyper-V there have been several important updates. (Updates till September 2008)
The following table provides an overview of when to use which update.
| KB# | Description | Link |
| Hyper-V RC to RTM update. Mandatory update! | Download | |
Hyper-V update : A Hyper-V update is available to increase the number of logical processors and virtual machines on a Windows Server 2008 x64-based computer Install this update if the host has more than 16 logical processors. |
Download | |
| Description of the Hyper-V update for issues that may occur when you manage the Hyper-V role on the 64-bit editions of Windows Server 2008 by using SCVMM Install this update if the host is managed by SCVMM. | Download | |
| A Background Intelligent Transfer Service (BITS) client cannot handle files that have paths that contain the volume GUID in Windows Server 2008 or in Windows Vista Service Pack 1 Install this update if GUID paths are used. | Download | |
| Windows Server 2008 Hyper-V VSS writer is not used during a backup job because of corrupted or invalid virtual machine configuration files Mandatory update when VSS is used for backups. | Download | |
| Increased functionality and virtual machine control in the Windows Server 2008 Failover Cluster Management console for the Hyper-V role Mandatory update when virtual machines are clustered. | Request update | |
| The NLB host does not converge as expected on Windows Server 2008 Hyper-V virtual machines Mandatory update when virtual machines are clustered using NLB. | Request update | |
| Error message when you try to start a Hyper-V virtual machine on a Windows Server 2008-based or Windows Vista-based computer that uses the NUMA architecture: "An error occurred while attempting to change the state of virtual machine VMNAME" Mandatory if host uses NUMA architecture. | Request update | |
| A computer that is running an x86-based version of Windows Server 2008 or an x86-based version of Windows Vista may use fewer processors than expected if the number of cores on a socket is not a power of 2 Mandatory update if you are running multi proc virtual machines on a physical processor with e.g. 6 logical processors. | Request update |
More info on KB articles related to Hyper-V on (in the community section):
technet.microsoft.com/en-us/library/cc754747.aspx
Thanks to our colleague Joachim Gomard for providing a lot of the content.