Correct. If you're so inclined, you can also replace 0 and 3 concurrently, since they're not part of the same arrays. As for the disks spinning up, what you should expect to see happen is a state change upon replacement for those disks to rebuilding, instead of Foreign or Failed. Once the rebuild completes, you'd see another state change to Online. Once you get that positive indication, you should then be able to offline the remaining disk for replacement.
3 of my 5 HD's in my raid array are blinking orange. I have a couple questions when it comes to replacing them. What if I cant find the same storage size replacement HD's? All replacements I have found on Dell are bigger and faster than the originals. If I have 3 of them failing ... should I replace them one at a time and have the array rebuild? Sean Smith
Replace T620 raid hard drives