Interesting, if overly long, story on IBM mainframes, how they work, and why they are still around. TLDR: they are extremely fast, extremely reliable, and run the legacy code that Fortune 500 companies have been running for decades. Migrating all that legacy code is extremely expensive and very risky, so most companies keep the legacy code around. https://arstechnica.com/information-technology/2023/07/the-ibm-mainframe-how-it-runs-and-why-it-survives/
@twbrandt I wish this article existed when I started working for IBM - would’ve greatly accelerated my initiation into zOS acronym hell! (I managed the storage addressing re-architecture piece of zOS 1.10 and the full release of zOS 1.13 back in the day.)
I’m constantly impressed by the evolution of the platform and the vision of my former colleagues. It also helps that they focus on making migration to the *next* zSeries machine or zOS release easier than migrating away. Still the cash cow.