I have three redhat servers and 2 of them's disk access lites blink normally, when (and how much) you would expect them to. The third ones disk access lights blink all the time. I'd estimate atleast once a second every second, even if there in nothing going on at all.

I have no idea where to start looking to figure out why - and I'm not even sure if I should worry about it or not.

Can anybody help?