Hard drive going offline

I have a drive that has been periodically making a clicking sound
(like it's shutting down), but it's temporary seems to be
back online when checked. It does not sound like thermal recal. No
messages in the event queue.

There are nine drives in this system, so it's difficult to tell which
one is doing this. Mostly Seagates from 300 to 750GB, if that matters.

Is there any way to monitor drive activity to track this down?