With KB249280 Microsoft issued a new hotfix rollup for Virtual Machine Manager 2008 R2 that deals with five issues around Performance and Resource Optimization (PRO), mapping of virtual switches to teamed network adapters, V2V to CSV, P2V with Windows Server 2003 and migration of highly available guests between clusters: http://support.microsoft.com/kb/2492980
Very likely this is the last rollup before we receive SP1 for SCVMM 2008 R2 which integrates the new Dynamic Memory and RemoteFX functionality found in Hyper-V R2 SP1.
If you’ve configured Windows Update for Windows and other products, you’ll see that the update is ready for installation.
After the rollup is installed and the Hyper-V servers are refreshed, you’ll see a “Needs Attention” status in SCVMM. Just right-click on the host and update all agents. A reboot of the SCVMM server is required if you run the update while the Virtual Machine Manager Server or Agent is running.
Because in our lab we are running the Release Candidate of SCVMM 2008 SP1, it was odd to see the agent version number go down from 2.0.4516 to 2.0.4275.
I was actually surprised that we were able to install the hotfix rollup at all?
I was able to downgrade all hosts except for the domain controller which also runs SCVMM in our lab. I am not sure this update was really intended to be used with the SP1 RC. More on this later.
Update 1
The biggest problem was that the library had become useless because of the incorrect SCVMM Agent. All files in the library were missing and many of the SCVMM functionality could not be used. I decided to uninstall SCVMM but retain the database. After reinstalling the SP1 Release Candidate version of System Center Virtual Machine Manager 2008 and updating the agents, I was able to solve the problems.
Update 2
I received word from the SCVMM product team. Microsoft is aware of this problem and will update the detection part of the package to not offer the update when SP1 is installed.
Lesson learnt
Use this hotfix rollup only on SCVMM 2008 R2 RTM!
“If you can it doesn’t always mean you should”