I have a FAS3210A with 2 DS4243s, with each controller owning all the disks in a particular shelf. I need to reset one controller back to factory defaults to address some RG misconfiguration and set my root aggr to 64-bit, and have already migrated all data off the controller in preparation for this task. The other controller and its disks still contain production data, so I need to tread very carefully. I suspect that option 4 will only initialize the disks owned by that particular controller and leave the remaining disks visible via MPHA untouched but would like some confirmation of this. Would it be a good precaution to remove this controller's visibility to the other disks by disconnect the SAS cabling to the other shelf or should that be unnecessary?