Windows server 2008 r2 virtual machine uses much less memory then it has assigned

Guys,
I had a virtual machine with windows 2008 r2 operating system, running sharepoint, on a server where it had 6gb RAM memory assigned.
Now I bought a new server, which has 32 gb of ram. I moved my virtual machine there, and assigned 24gb of RAM.
But after I started VM, in Windows Task Manager I see that system uses only about 6.5 GB of RAM assigned. That is not even close to 24gb, which it has available.
Is there any power shell script or anything else available to increase virtual machine memory usage?
Thank you. 

Hi,
I found a KB similar described with your issue- the Hyper-V host cannot allocate more memory to the virtual machine because there is not enough free disk space to extend the
memory contents file, more detail symptoms please refer the following KB:
Dynamic Memory allocation in a Virtual Machine does not change although there is available memory on the host
http://support.microsoft.com/kb/2504962/en-us
Hope this helps.
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