How can I see what is using all the ram on a server

We have a server 2008 r2 x64 box which is intended to be logged into by users using remote desktop from their workstations.

The 2008 r2 server is one of three hyper-v vm's which are hosted on a much more powerful server (server 2012 with 64gb ram)

the 2008 r2 vm does not run sql or exchange or any other typical resource hog... just microsoft office 2013.  It also doesn't host files.

With no users logged in, no obvious programs running, just after a reboot, all 31gb is being used by something.  Whatever it is doesn't apparently show up in task manager or resource monitor.  0% cpu, 0% network, 0% disk... 99% memory.

How can i find out specifically what is using all this memory?  The server is almost unusable in the current state.

Attached are some diagnostic pictures
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FocISAsked:
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Leon KammerCommented:
I have had similar issues, but with a file server.

Try Rammap
http://technet.microsoft.com/en-US/sysinternals/ff700229.aspx

Microsoft had a version of DynCache for 2008 R2, I contacted support, but they claimed that it is no longer available and decided that it was too much of a hassle, so I migrated back to 2008.
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FocISAuthor Commented:
AWESOME - that's a great tool... i'm getting close.

it shows 29gb in "Driver Locked"

now to find out what driver locked up all that ram - wow
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Leon KammerCommented:
According to MS support, this is the way Hyper-V Dynamic Memory works.

http://blog.luxem.org/2013/05/driver-locked-memory-on-hyper-v-guests.html

If you shutdown the guest and uncheck Dynamic Memory from the guest memory properties it should return to some normal state.

Leon
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FocISAuthor Commented:
Quick and to the point, exactly what i needed - thanks!
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FocISAuthor Commented:
Disabling dynamic memory did fix it - it's a shame dynamic memory didnt work, but, we have plenty enough to go around so fixing it at 32gb is fine
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Leon KammerCommented:
glad I could help :)
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Windows Server 2008

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