Power off, unplug, replace controller, plug in, power on. Boot to the CTRL-R utility. If it recognizes the array as online and optimal, then you are done. If it does not and lists a "foreign configuration", then you need to IMPORT the foreign configuration before proceeding.
I have a server with RAID-1 Configured I just want to know how can I change the current installed RAID Card with new one without destroy my existing RAID Array.
Changing RAID Controller of 2950 Server