Why is not possible to add more memory to a DomU when using XEN in RHEL 5.x ?

Solution Verified - Updated -

Issue

  • It's not possible to add memory to a DomU guest.
  • After the change in guest's configuration file, and rebooting it, the amount of memory didn't increase.

Environment

  • Red Hat Enterprise Linux 5.X
  • Xen

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