> Dealing with system configuration, operations, and maintenance remains an unsolved problem.

I have no experience whatsoever with them, but I think I've seen many mentions over the years of how IBM mainframes have been designed to keep running while anything is modified or swapped out.

I also remember years ago reading about a research OS, which journaled everything such that you could supposedly pull the plug at any random moment and recover the running state with no trouble.

Link:

https://web.archive.org/web/20030430223846/http://www.eros-o...