RHEL 6 domU PV Xen guests cannot extend beyond 128GiB memory

Solution Verified - Updated -

Issue

  • Why can RHEL 6 domU PV Xen guests not extend beyond 128GiB memory, when RHEL 5 equivalent guests can extend to 168Gib?
  • I am not able to extend a RHEL 6 paravirtualized guest beyond 128 GiB of memory

Environment

  • Red Hat Enterprise Linux (RHEL) x86_64 Xen hosts
  • RHEL 6 x86_64 para-virtualized guests

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