(plural one-banana problems)
The phrase is used at technical worksites, where routine computer system administrative tasks such as daily backup are handled by operators, where it is claimed that a trained monkey could do the jobs. At IBM, folklore divides the world into one-, two-, and three-banana problems.
Derived from the idea that trained monkeys can do low-level jobs, working for bananas. It also may come from Sherlock Holmes lore. In one story he told Watson that the current problem was "quite a three-pipe problem", meaning that he would have it solved after smoking three pipes.