I realize the actual answer is "it depends". However I am looking for a general pattern. What I am concerned about is creating a RAID array (1 or 5, etc.) and having trouble with a faulty controller down the line. I can pick up a promise raid card or even use a smart-array on an HP/Compaq.
What I'm wondering is what happens when you go to replace a component like this? Do you replace the card, reconfigure a raid with dummy drives? Can you swap an existing raid "pair" (for example) and pull the drives and plant them onto another server? Some have said that the raid info is kept on either the controller, the drives, or both. I don't have a lot of equipment to experiment with, but I am looking for, again, patterns. I'm happy to clarify if need be.