The fence agent would have to use the HMC for power systems. I don't see an HMC fence agent for CentOS. If you are using and paying for RHEL subscriptions, maybe you can open a ticket with Red Hat for them to add one upstream?

The fence agents are in the main channel of RHEL/Centos systems. You should be able to use the following command to list the available agents. You could use a similar apt-get command for other linux distro's.

Code:

yum list 'fence-agents-*'

Here is a list of all of the packages the base channel for CentOS7 for PPC64.

Code:

http://mirror.centos.org/altarch/7/os/ppc64/Packages/