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I am using Windows Server 2008 R2 Box for my development purpose. I could not see any hibernate/sleep option in the shutdown options. What could be the reason to hide these options for a server machine?

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Maybe because there's no use for those options on a server? Why would a server ever need to hibernate and not shut down or restart? –  AndrejaKo Jan 19 '12 at 6:11
    
yea I agree. hibernation/sleep isn't really suitable for a server environment. I just wanted to make sure if it's the only reason. –  sarat Jan 19 '12 at 6:16
    
Not all servers are required 24/7. If your servers are running LOB operations for a single time zone then it makes sense to have them reduce power usage when not required. Many companies have around 40 working hours in a week and there are 168 hours in a week. –  Colin Pickard May 8 '13 at 23:04
    
True. But some people arrive early (before 7AM), some leave late (say 8 PM). Some work on the servers from home (e.g. me, usually 8 to 10 hours per weekend). So a Server often needs to be on for far more than the 40 hours. –  Hennes Sep 11 '13 at 16:11
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up vote 7 down vote accepted

Have you installed Hype-v role? If yes, then Windows disables the Sleep and Hibernate options. You will need to make the Hyper-V service start on Demand for Sleep and Hibernate options to be re-enabled.

Refer to this blog post for details.

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