[inopinatus]

This is absolute cobblers. I worked in an IT team that had a pair of IBM mainframes that were fed and watered at crushing expense and for which even the tiniest software change required a colossal waterfall project.

One day, they failed. One went offline - for reasons never revealed, at least to me - and the secondary didn't come up. Radio silence, kaput. But an airline that housed mainframes in the same DCs had their booking system fail at exactly the same times (with national headlines to match).

The myth of mainframe uptime is exactly that. La-la-land for hardware & services salesmen.

[nickpsecurity]

Appreciate the counterpoint. Could in fact be a myth or legend. Lots of money to justify spreading disinformation, too. Maybe an anonymous survey by a reputable organization is in order that tries to break down what issues people have and don't have along with specific metrics. Then compile that into a big picture.

Meanwhile, the companies I've worked at all had mainframes without trouble from them that people said. Problems were virtually always the app developers or the pain of doing 21st century stuff with 60's-80's architecture or legacy code.