在server 2012 hyper v里运行的一台server 2012经常自动关机，日志没查看到明显故障提示，查看hyper v settings发现虚拟硬盘挂接的是avhd格式，与父盘合并后重新挂载，暂时故障消失。

3月11号更新：问题其实是windows license没激活导致的关机。日志里有详细的记录，不过记录不是在error和warning而是正常的日志里。绕过去的办法是使用pstools删除wlms服务。

?详细步骤如下：

How to remove the Windows Licensing Monitoring Service from the evaluation media of Windows 2008 R2 and Windows 7 Operating Systems

24/06/2012

• Download the ps tools from
• Extract it to the local disk (I have done it under c:\)
• Open the command prompt in an elevated mode (run as administrator).
• Navigate to the ps tools folder (in my case its c:\psexec)
• Run the command psexec –I –d –s cmd

• Click ‘Agree’ on the license agreement.

• This will open the command prompt as ‘nt authority\system’ (To verify it run the command whoami on the new command prompt)

• Run the command ‘sc delete WLMS‘ to delete the Windows licensing monitoring service.

• Run the command regedit to modify the registry
• Navigate to HKLMàSystemàCurrentControlSet àServices

• Delete the key ‘WLMS’ key.

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