How do you add more memory to a Hyper-V VM

If the host Hyper-V only has 48 gig and the VM's are using 44 gig, can more memory be added to a VM.  In other words can you only use physical memory or is there virtual memory?  If more can be added how?
J.R. SitmanAsked:
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Philip ElderConnect With a Mentor Technical Architect - HA/Compute/StorageCommented:
You should leave about 1.5GB of available RAM to the host.
For the VM that requires more vRAM shut it down, open its properties, and up the amount of memory assigned to it.

You cannot add more vRAM to a VM than available RAM - ~1.5GB.

Memory is cheap, upgrade the RAM in the physical box.
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KCTSCommented:
I assume you are talking about virtual disk space - not memory!

See http://www.altaro.com/hyper-v/how-to-resize-online-virtual-machine-hard-disks-in-hyper-v-2012-r2/
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J.R. SitmanAuthor Commented:
Can memory be allocated to VM's in 2 gig increments.  i.e. can they use 6?  Or can they be allocated in 1 gig, i.e. 3?
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Philip ElderConnect With a Mentor Technical Architect - HA/Compute/StorageCommented:
Increment for assigning VM vRAM is 2MB in even numbers.
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Andrew Hancock (VMware vExpert / EE MVE^2)Connect With a Mentor VMware and Virtualization ConsultantCommented:
If you add more memory to your VMs, than you have available in the host (which is possible), the host will start to swap to disk, and performance will be very poor.

Take a good look at the current VMs, and see if they require the memory allocated, or add more physical memory to the host.

Host memory is often the bottleneck.
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J.R. SitmanAuthor Commented:
how can I determine what memory the VM's require.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Check the performance and statistics, check how much they are using.

e.g. if you have assigned 16GB, check the performance, and stats, and see if 16GB is being used.
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J.R. SitmanAuthor Commented:
Sorry, I had a brain fart when I asked that question.  I knew the answer, but my light was off.  :-)
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J.R. SitmanAuthor Commented:
thanks to all.
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