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Hot-plug Memory Fails on CentOS 7

Problem: After creating a CentOS 7 instance from ISO the Profile is changed to add more RAM, but the instance does not recognize the additional RAM

Cause: This is a kernel bug

Solution: Blacklist the rapl module:

  • Boot into the CentOS 7 instance
  • Run vi /etc/modprobe.d/blacklist.conf
  • Press i to edit the file.  Add blacklist paevm to the bottom of the file, then press ESC and type :wq to save the changes and close the file
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