Hi, best approach is to log onto your service processor and follow the link to "Guided Maintenance" and follow the steps here.
Where will you be obtaining a disk from? I think you will find that simply removing a disk from the caddy and replacing with another one will not be picked up by the array. It seems that the array stores the wwn of the caddy rather than the new disk so even adding a new disk not enough because the array is still looking at the wwn of the caddy.
On the other hand if you have caddys which have never been placed into the array then you should be fine