I'll quickly show here the procedure for replacing a Physical Disk in predictive failure status in the Storage Cell.

Check which disk is failed:

List the LUN to see more details and make sure that is not used for Cell OS:

Check if there is any griddisk that cannot be deactivated. If any griddisk is listed then you cannot proceed before fixing the issues that are preventing the griddisks to become inactive.

List the disk again before the replacement:

Drop the physical disk for replacement and then inform the Field Engineer onsite that he is ok to proceed with replacing the disk in the storage server:

Oracle Field Engineer removes the physical disk from the disk slot:

The Field Engineer inserts the new disk into the slot and you are not able to see the disk by its previous serial number anymore:

You can query using the enclosure and slot numbers which makes the name of the disk:

Happy disk replacement.

Franky