Tech Line

Virtual Server Shutdown Stalemate

Here’s how to allow VM save state operations time to complete when a Virtual Server host is shut down.

I think I found a bug in Microsoft Virtual Server. I'm running Microsoft Virtual Server 2005 R2. For each VM on the server (I have eight), I have the "Action When Server Stops" property set to Save State. For some reason, this doesn't always seem to work when I shut the server down. Now I'm finding myself manually doing this from the Master Status page before shutting down the server. Shouldn't the automatic Save State feature prevent me from having to do this?
— Khalid

Tech Help—Just An
E-Mail Away

Got a Windows, Exchange or virtualization question or need troubleshooting help? Or maybe you want a better explanation than provided in the manuals? Describe your dilemma in an e-mail to the MCPmag.com editors at mailto:editor@mcpmag.com; the best questions get answered in this column and garner the questioner with a nifty MCPmag.com baseball-style cap.

When you send your questions, please include your full first and last name, location, certifications (if any) with your message. (If you prefer to remain anonymous, specify this in your message, but submit the requested information for verification purposes.)

Good question, Khalid. In theory the Save State operation works just fine. Virtual Server does try to save the running state of each active virtual machine when a system shutdown event begins. The real problem here is not Virtual Server but, instead, an impatient operating system.

While Virtual Server is trying to shut down, Windows is saying "Come on! Hurry up! I don't have all day!" Then the OS starts its countdown. If the service has not stopped by the time the OS decides to wait, the service is forcefully terminated.

The termination timeout is configured using the following registry string value:

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\
WaitToKillServiceTimeout

The number assigned to the value represents the amount of milliseconds that the OS will wait for a service to gracefully shutdown. The default value is 20,000 milliseconds, or 20 seconds. If the time is exceeded, the service is terminated so that the OS can continue the shutdown process. In your case, I recommend that you increase the value to a significantly higher number, such as 300,000. This would allow for a five-minute wait (300,000 milliseconds is equal to 300 seconds). If this is not ample enough time, then you could raise the value to 10 minutes -- 600,000.

For quicker VM shutdowns, also consider changing the "Action when Virtual Server stops" for each VM from "Save State" to "Shut Down Guest OS." However, this requires that the VM additions be installed in each guest OS. For Linux guest VMs, you need to download the Virtual Machine Additions for Linux, which is currently in beta.

I hope this helps.

About the Author

Chris Wolf is a Microsoft MVP for Windows --Virtual Machine and is a MCSE, MCT, and CCNA. He's a Senior Analyst for Burton Group who specializes in the areas of virtualization solutions, high availability, storage and enterprise management. Chris is the author of Virtualization: From the Desktop to the Enterprise (Apress), Troubleshooting Microsoft Technologies (Addison Wesley), and a contributor to the Windows Server 2003 Deployment Kit (Microsoft Press).learningstore-20/">Troubleshooting Microsoft Technologies (Addison Wesley) and a contributor to the Windows Server 2003 Deployment Kit (Microsoft Press).

comments powered by Disqus

SharePoint Watch

Sign up for our newsletter.

I agree to this site's Privacy Policy.