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Advice on setting up time server in hyper-v environment

Our DCs are virtualised within a Win 2008 R2 Hyper-V environment on a network not connected to the internet.  
Does anyone have advice as to best practice for setting up time service?

Currently I manually correct the time on the PDC (virtual) and have group policy set so that all servers and computers look to this pdc to set their time.
I have disabled the Time Integration within HyperV settings - but I seem to have a problem when rebooting the physical host that the PDC is running on. Possibly because the host cannot find the DC when it first starts up, it seems to make up its own time which then pushes to the dc and all other servers.Not sure if the host is getting the time from the bios, which I do keep correcting - but seems to be trailing off quite fast.

In any event I want to prevent the PDC from changing time unless I expressly correct it - as a simple reboot of the host server means the time is changed on all desktops and servers to something up to an hour out!
Any help gratefully received
thanks
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itadminuk,

Did we answered your question or do you need some more information?

Greetz,
Robin
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itadminuk

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thanks guys for your quick responses. really really helpful. Robbe - I can't configure an ntp server as it's not connected to the network but it does look as though I am going to have to see why the physical host time keeps drifting off.
Also Shahid - that's really answers the question - I didn't realise that the vM would STILL take the time off the host even with integration turned off.
I am now going to investigate whether I can use a physical dc or take the host off the domain and into a workgroup.
thanks guys
Can Say it with surety as I have read it in the book, "Mastering Microsoft Virtualization", Chapter 3, Page 104, Heading "Integration Services". Mentioning here for reference

Regards,
Shahid