The Windows Server Notebook

Jun 18 2010   7:53PM GMT

New Microsoft hotfix solves Hyper-V host startup issues – or does it?

Bcournoyer Brendan Cournoyer Profile: Bcournoyer

Just a quick post today. Microsoft released a new hotfix this month in response to some startup hang issues involving servers hosting virtual machines. Basically, some users running Windows Server 2008 R1 or R2 with Hyper-V have experienced increasingly slow OS startup times following a disk backup.

Systems engineer and IT writer Rob McShinsky said he has dealt with the issue for about a year now, which he said is caused by a “registry bloat” of past snapshots on the host machine. He noted that the startup lag would get longer and longer with each backup since more and more entries were being added to the registry.


McShincky recently posted a workaround for the problem on his blog that involves cleaning out these orphaned snapshots from the registry using the DevNodeClean utitlity. The workaround is necessary for those running Windows Server 2008 RTM, as the new Microsoft hotfix (Knowledge Base article 982210) only installs on Windows Server 2008 R2 (with the Hyper-V role installed) and Windows 7 systems. The lack of Server 2008 functionality is curious, seeing how that is where the issue started, and it seems the bug is connected to the OS itself rather than Hyper-V specifically.

McShinsky wrote that he is “currently testing the Hotfix on some of [his] Windows Sever 2008 R2 with Hyper-V servers.” Even if the long-term results are positive, however, the DevNodeClean workaround appears to be the only option for those running Hyper-V machines on the original release of Windows Server 2008 – for now.

For more Windows Server troubleshooting tips and advice, visit SearchWindowsServer.com.

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