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I have 4 VM's running on hyper v 2008 R2 enterprise. Two of them have a warning memory status. Thus both have more memory demand than assigned memory.

But On windows the physical memory usage is only 12gb. The server has 32GB.

How can I get Hyper V to use more system memory?

  • Are the VM's using static or dynamic memory? Does the memory demand exceed the provisioned or maximum memory for the VM's? – joeqwerty Nov 19 '15 at 13:32
  • Yes, all are on dynamic. None are over the maximum allowed. – blackwolfsa Nov 19 '15 at 13:51
  • According to performance monitor, Hyper v has about 22Gb of available ram of the server's 32GB currently. But the 4'vms use: 5, 0.5, 2.4 and 1 respectivly. – blackwolfsa Nov 19 '15 at 13:52
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    Well you didn't really answer my questions. Does the memory demand of the virtual machines exceed the allocated/provisioned memory for those virtual machines? If so, then you need to allocate/provision more memory to the virtual machines. Hyper-V will not grant more memory to the virtual machines than what is allocated/provisioned. – joeqwerty Nov 19 '15 at 13:57
  • Sorry I didn't add it clearly enough. No None of the VM's memory demand is over their maximum allowed/allocated/provisioned memory. – blackwolfsa Nov 19 '15 at 14:39
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Check to make sure you have free space on the disk where your snapshots are stored. In the case of failure, Hyper-V will pause the VM and write the RAM to the snapshot folder. If there isn't enough available disk space to write a complete snapshot, then Hyper-V will not add more RAM.

When adding RAM fails because of this, you'll see events in the event log on the Hyper-V host.

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