Here it is. We have a new KB that details updates and hotfixes required for SCVMM, Hyper-V and Clustering. Read the article here.

I've commented on the hotfixes inline below, providing a Support Engineer's perspective.

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Required hotfixes for Hyper-V servers

Install these. No question.

  • 956589  (http://support.microsoft.com/kb/956589/ ) 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
  • 956774  (http://support.microsoft.com/kb/956774/ ) 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
  • 950050 (http://support.microsoft.com/default.aspx?scid=kb;EN-US;950050/ ) Description of the update for the release version of the Hyper-V technology for Windows Server 2008

Note If these hotfixes are missing from a Hyper-V server, the System Center Virtual Machine Manager 2008 Admin Console lists the server status as Needs Attention. Hotfix 956774 should be installed on the Hyper-V servers and on System Center Virtual Machine Manager 2008 Server.

Recommended hotfixes for System Center Virtual Machine Manager 2008 Server

I would change this from 'Recommended' to 'Required' based on experience.

  • 958124  (http://support.microsoft.com/kb/958124/ ) A wmiprvse.exe process may leak memory when a WMI notification query is used heavily on a Windows Server 2008-based or Windows Vista-based computer
  • 954563  (http://support.microsoft.com/kb/954563/ ) Memory corruption may occur with the Windows Management Instrumentation (WMI) service on a computer that is running Windows Server 2008 or Windows Vista Service Pack 1
  • 955805  (http://support.microsoft.com/kb/955805/ ) Certain applications become very slow on a Windows Server 2008-based or Windows Vista S955805-based computer when a certificate with SIA extension is installed
  • 959596  (http://support.microsoft.com/kb/959596/ ) Description of the System Center Virtual Machine Manager 2008 update to address physical to virtual (P2V) issues

Recommended hotfixes for the Hyper-V servers

Install ALL hotfixes on ALL Hyper-V servers, whether SCVMM is involved or not. This is more than a recommendation based on cases I have worked.

  • 957967  (http://support.microsoft.com/kb/957967/ ) Stop error message on a Windows Server 2008-based computer that has the Hyper-V role installed: "STOP 0x0000001A"
  • 958124  (http://support.microsoft.com/kb/958124/ ) A wmiprvse.exe process may leak memory when a WMI notification query is used heavily on a Windows Server 2008-based or Windows Vista-based computer
  • 954563  (http://support.microsoft.com/kb/954563/ ) Memory corruption may occur with the Windows Management Instrumentation (WMI) service on a computer that is running Windows Server 2008 or Windows Vista Service Pack 1
  • 955805  (http://support.microsoft.com/kb/955805/ ) Certain applications become very slow on a Windows Server 2008-based or Windows Vista S955805-based computer when a certificate with SIA extension is installed

Recommended hotfixes for Hyper-V failover clusters

  • 957311  (http://support.microsoft.com/kb/957311/ ) Recommended hotfixes for Windows Server 2008-based server clusters