On Thu, 10 Feb 2022, Rich Shepard wrote:
A clue is needed so I can rebuild the RAID1 and rebuild my backup bank.
I turned off the Probox, waited a bit, turned it back on. Then rebooted the desktop. Once again the four drives in the Probox are /dev/sd{c,d,e,f} so I can now rebuild the RAID1 on the latter two drives. Rich