At some point in history, I had the misfortune of working with Stratus hardware.
Not quite where you describe the Z system, but it did operate with hot swappable components, and multiple OS's running in a "fault tolerant" manner.
We hit show stopping firmware bugs that managed to take down every OS. The end result was that the three standalone Dells on top of it had better uptime.
I always wondered how the mainframe world ever managed this. When you market is so small (relative to x86) every case is an edge case. Surely these extremely large and expensive devices still had bugs that transcended that redundancy.
We hit show stopping firmware bugs that managed to take down every OS. The end result was that the three standalone Dells on top of it had better uptime.
I always wondered how the mainframe world ever managed this. When you market is so small (relative to x86) every case is an edge case. Surely these extremely large and expensive devices still had bugs that transcended that redundancy.