““Much of my career has involved rewrites of critical systems. You would think such a thing is easy—just make the new one do what the old one did. Yet they are always much more complex than they seem, and overflowing with risk. The big cut-over date looms, and the pressure is on. While new features (there are always new features) are liked, old stuff has to remain. Even old bugs often need to be added to the rewritten system.””
![“Bill Baker, a distinguished engineer at Microsoft, quipped that we used to treat servers like pets: “You name them and when they get sick, you nurse them back to health. [Now] servers are [treated] like cattle. You number them and when they get sick, you shoot them.” quote by Gene Kim](https://sms4smile.com/quotes/img-quotes/e7b/gene-kim-2268_health_bill-baker-a-distinguished-engineer-at-m_187582.jpg)
