I found that one of the Windows 2008 VM's on ESX VI3 was running out of space, and so I investigated. It turns out that there was a hiberfile.sys lurking on the system drive. I tried to delete, but wouldn't let me, I tried to find the option in Control Panel\Power Options, but nothing there. Turns out the following command needs to be run
powercfg.exe /hibernate off
Low and behold, the file is gone, and a few GB of disk storage is returned :)
Checked this on the Hyper-V W2K8 VM's, and it says that hibernation is not supported by the firmware, so not an issue.
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