Hot-Plug memory failure on CentOS 7

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.

This is a kernel issue.

To resolve the issue, blacklist the rapl module:

  1. Boot into the CentOS 7 instance.
  2. Execute the following command:

    vi /etc/modprobe.d/blacklist.conf

  3. Type i to edit the file.
  4. Add blacklist paevm to the bottom of the file. Then press ESC and type :wq to save the changes and close the file.