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hiberfil.sys on a server

We noticed we suddenly lost about 32GB of disk space on our C: drive, and found that we now have a hiberfil.sys (32GB), that we 'do not think' was there before.

This is a Windows 2008 R2 server, only a few weeks old.  

Looking online, I found some ways to disable hibernation, but the commands tell me that hibernation is not enabled on this server.  

Any thoughts on why this file is there, or what might have caused it?

Thanks
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compsol1993
Asked:
compsol1993
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1 Solution
 
strivoliCommented:
When you run CTRL+ALT+DEL you get a full Window. On the botton-right corner there is the Shut Down button. Click the little arrow for the options. Is the Sleep option there?
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compsol1993Author Commented:
No no sleep option -- just shut down and log off.
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Lee W, MVPTechnology and Business Process AdvisorCommented:
What's the time stamp on the file?  If Hibernation is not enabled on the server (a good thing) than the file shouldn't be there.  (Are there VMs on the server?)  Rename (DO NOT DELETE OR MOVE) the file and reboot.  Does it come back?  Is there a problem?  If there's a problem, then boot to a windows install DVD and rename the file back.  If there is no problem, MOVE the file to another drive.  If no problem occurs and the file doesn't reappear, then delete it in a week.  (Yes, Hiberfil.sys SHOULD be safe to delete, but this is a SERVER and it presumably runs critical services for your network so even though 99.9% chance it's safe to delete if Windows allows you to, PLAY IT SAFE and follow the RENAME/MOVE/DELETE procedure).
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compsol1993Author Commented:
Thanks for the ideas.  This server does run 2 VMs.  Would that be part of the problem?  

When I try to rename, it says access denied, file is in use.

Thanks
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strivoliCommented:
I would check which action is performed when you press the power button (the physical button on the front of the Server).
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compsol1993Author Commented:
It was set to power off, which I didn't want, so I changed it to do nothing this morning.  This was after we noticed the large file.  They were the only two options for that action.

We did install the Cyber Power utility originally that shuts the server down.  It mentions hibernate in there, but is not enabled.
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strivoliCommented:
Check the file's properties about the date/time creation. Look at the Windows Application/System logs for any helpful entries near that date/time.
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strivoliCommented:
Is there any UPS that rules Server's behavior when the UPS runs on batteries and these are quite over?
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Lee W, MVPTechnology and Business Process AdvisorCommented:
Do the VMs have power management enabled?  Check them.  As I recall, Hyper-V integration allows the VMs to store things like Pagefile and Hibernate files OUTSIDE of the VM's VHD for better performance.  If the Hiberfil file was in use, then SOMETHING has it in use and it's not just there for no reason.
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compsol1993Author Commented:
Thanks for the help with this!
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