Agreed. They are workhorses that keep on running. If/when a piece of hardware fails like a disk or RAM it gets hotplugged via the Hardware Management Console [1] and since it has single level storage [2] all pages in RAM are protected for 48 hours in the event of a catastrophic power failure.

[1] https://www.ibm.com/docs/en/POWER5/iphan_p5/iphanbook.pdf

[2] https://community.ibm.com/community/user/power/discussion/ib...