Why does starting or live migrating a VM in a RHEV cluster fail despite Cluster Memory Optimization being set to "For Server Load - Enable memory page sharing to 150%"?

Solution In Progress - Updated -

Issue

  • When I try to start a VM I get the following error message:
Error while executing action:

<hostname>:

    Cannot run VM. There are no available running Hosts with sufficient memory in VM's Cluster .
    Cannot run VM. There is no host that satisfies current scheduling constraints. See bellow for details:
    The host <hostname> did not satisfy internal filter Memory.
  • The amount of free memory in the host is lower than the amount of memory configured for that VM, but the Cluster Memory Optimization is set to For Server Load - Enable memory page sharing to 150%.

Environment

  • Red Hat Enterprise Linux 3.3 and 3.4.
  • Cluster Memory Optimization set to "For Server Load - Enable memory page sharing to 150%".

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