I would suggest backing your system up in its entirety at least once. You can then add the drives to the asp and turn on parity protection on the newly added drives. You shouldn't have to do a restore as long as you don't have 2 drives fail in your raid set while you are adding the additional dasd. I would then do some load balancing on your asp or you could see some performance hit due to all activity happening on your new drives.
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