You can't return the foreign configuration after you clear it. In this case, you don't want to either. If you are simply replacing a bad drive in an otherwise functional array, then you need to assign it as a hot-spare to start the rebuild. If you had imported the foreign configuration, you would be performing a complete bare-metal restore from backup right now.
I have a RAID 5 and one of the drives went bad. I replaced it with a new drive and entered the Controller Config (cltr r). I went to the foreign disk tab and hit clear instead of import. Now the drive say ready and I cant do anything but make it a Hot Spare. How to I make the disk a foreign disk again?
RAID 5 drive bad