There was one point in my life when I was working for a large mainframe company ;) A bank wanted to move a system to a new site. The uptime on that system was 1

There was one point in my life when I was working for a large mainframe company ;) A bank wanted to move a system to a new site. The uptime on that system was 11 years. Uptime on a mainframe system is pretty much considered 100% 4 hours downtime a year is just way to much for some systems. Just have a google for "mainframe uptime". Yes the software is abstracted from the HW redundancy. You can pull CPUs with running code in systems and things keep working. Really - walk up and pull the CPU out. No impact to running code. Heck you can run your private cloud on one: https://www.fool.com/investing/general/2015/01/24/heres-why-ibm-is-still-building-mainframes.aspx https://www.fool.com/investing/general/2015/01/24/heres-why-...