I disagree. A disk can be full with no critical service ever failing, especially if it's something like a root disk but the app is on another device. For memor

I disagree. A disk can be full with no critical service ever failing, especially if it's something like a root disk but the app is on another device. For memory, depending on the definition of "full," it, too, can be just fine. Even having something like individual app servers die and get restarted by Apache isn't such a bad thing if the cause is a slow enough memory leak.