Reminder that SMART is not magic, in my experience, disks are dead long before SMART stops reporting them as 'PASSED'.
I actually came across the perfect example today: Two disks in my backup server are having issues, one is clearly broken, the other gave 2 checksum errors.
Despite this, neither disk is 'failed' according to SMART, one has 456 offline uncorrectable errors / pending sectors, the other one is fine.
Don't rely on broken hardware to tell you that it's broken.
the other disk's SMART info, a Seagate 4TB drive, showing 456 pending/offline uncorrectable sectors, however it is also marked as 'PASSED'. The disk has been used for 7 years (70k hours), and is currently 27C.
the disk that had 2 checksum errors, a Seagate 4TB drive, showing zero signs of issues in SMART, healthy temperature of 29C, though it has been on for 68145 hours (7.7 years)
ZFS pool status overview, showing 2 disks with issues, 1 being marked as FAULTED. The faulted one has 789 Read errors and 14 checksum errors. The other one only has 2 checksum errors.
it's a mixed array anyway, it wouldn't be a Redundant Array of INEXPENSIVE Disks if I stuffed it full of new enterprise drives haha (smh companies always get this wrong)