Max Memory size of a single VM?

Solution In Progress - Updated -

Issue

  • System has 256GB of RAM and 2 8 core CPUs. Tried to create a single VM with 250GB of RAM for the guest. VM create fails and libvirt log states it's unable to create the VM due to this error
could not allocate the requested memory".  

Environment

  • Red Hat Enterprise Linux 6.5
  • KVM

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