[CentOS] An mdadm question

CentOS 7.

I have a server with four drives. 1 is /, and the other three are in
RAID5. I need to pull a drive, so I can test whether the server can read >
2TB drives. I've been googling, but don't want to screw the server up....

I think I'd like to
  1. stop the RAID
  2. pull a drive
  3. put in a large drive, and run parted, and mkfs
  4. pull the large drive
  5. replace the RAID drive
  6. fire up the RAID.

So, can I do it in that order? Do I need to fail something?

       mark