You could, but I would do before it was created (or at least loaded). They take a good part of a day depending on drive size. The idea is to not put faulty stuff into production. Even with brand new drives. My thought is why create more work by having to recover stuff, etc. when it can be easily prevented by one day (or portion thereof) of tests. Otherwise, you can be left guessing or spending days of tests to isolate some exact cause.