IBM advertise 8 nines of reliability for the z17 (i.e. a second of downtime per year). If you have a workload that cannot go down it's going to be more reliabl

IBM advertise 8 nines of reliability for the z17 (i.e. a second of downtime per year). If you have a workload that cannot go down it's going to be more reliable than orchestrating a bunch of cloud servers where you're dealing with the network, hosts going down, failing, or issues with errors in the CPU (yep ... happens at scale). They also test the hardware to exacting standards - 8.8 magnitude earthquake is one example.