Must Have Windows Server 2008 R2 Hyper-V Hotfixes

Now there's a damning blog post title!

In brief, I've had a few issues since installing Windows Server 2008 R2 and adding the Hyper-V Role on my Dell Precision M6500 Core i7 laptop (if you've landed on this post and you don't care about laptops--i.e. you're an admin--don't stop reading now as this post will likely apply to you too). This post is meant to be a running log of problems and their resolutions while we await the next service pack, I suppose.

Problem #1: Blue Screen of Death/random reboots

Resolution:

• Install the http://support.microsoft.com/kb/975530 hotfix on your Hyper-V hosts or use the work around detailed in the KB article.

KB975530: Stop error message on a Windows Server 2008 R2-based computer that has the Hyper-V role installed and that uses one or more Intel CPUs that are code-named Nehalem: "0x00000101 - CLOCK_WATCHDOG_TIMEOUT"

Symptoms, event log entries, and whatnot: Unexpected freezes, BSODs and reboots during periods of high network activity.

• Event ID 219, The driver \Driver\WUDFRd failed to load for the device USB\VID_0A5C&PID_5800&MI_01\7&66de6c9&0&0001.
• Event ID 41, The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly.
• Event ID 4, Broadcom NetXtreme 57xx Gigabit Controller: The network link is down.  Check to make sure the network cable is properly connected.
• Event ID 1001, The computer has rebooted from a bugcheck.  The bugcheck was: 0x00000101 (0x0000000000000019, 0x0000000000000000, 0xfffff880020ce180, 0x0000000000000003). A dump was saved in: C:\Windows\MEMORY.DMP. Report Id: 043010-31168-01.
  

Apparently this issue is caused by an Intel erratum affecting Nehalem-based processors (i.e. Xeon 5500, Core i7-800, and Core i5-700 series).

Problem #2: Guest VMs freeze, lost connection

Resolution:

• Install the http://support.microsoft.com/kb/974909 hotfix
• Install the http://support.microsoft.com/kb/981836 hotfix (this KB is specific about Windows Server 2003 but a Microsoft representative suggested it's applicable to all VMs as the hotfix updates the integration services components generally)
• Update integration services on all guest VMs

None of this worked for me but changing my host power settings from Balanced to High performance did. In theory you should be able to revert to Balanced after installing and the above.

You may also want to investigate turning off TCP offloading.

Symptoms, event log entries, and whatnot: Hyper-V console freezes in some virtual machines but not others (the only one affected in my case was an XP VM upgraded from Virtual PC 2007 SP1), Hyper-V manager reports the Heartbeat as "Lost connection".

• Event ID 5: The miniport 'Microsoft Virtual Machine Bus Network Adapter #3' hung.

...followed by...

• Event ID 4: The miniport 'Microsoft Virtual Machine Bus Network Adapter #3' reset.

For additional information about this problem, definitely check out http://social.technet.microsoft.com/Forums/en-US/windowsserver2008r2virtualization/thread/0408a28d-6ab8-4c85-8773-4bc42c2df40b

More to come? Hopefully not! ;-)

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