I'm running into a similar issue on a system.
I have: Disk ST14000Naa11 ZHZ48MVX is FAULTED
Say I don't want to replace the drive. Instead I would like to just let another drive be the backup. There are 6 14TB drives for a total of 66.96 TB. But I'm only using 2TB so far of the space. Disk 3 has faulted, and I would be okay with only having 5 14TB drives.
How do I do this?