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Hello:
I recently switched out a MacMini to MacStudio operating under MacOS 15.6. All four disks reside in a ThunderBay4 purchased in late 2018 (maybe late 2019). SoftRaid/Thunderbay 4 has been an issue until now. SoftRaid v.5.8 Driver v5.8
This AM, SoftRaid generated a warning for that Disk 1 (4505 hr) "developed a disk failure predicted” Shortly thereafter, the remaining three disks show i/o 14 errors. These disks have a been in use anywhere from 5900 to 12500 hours. I have unmounted the array and rebooted the computer. Still the errors remain.
It seems unlikely to me that suddenly all disks have errors.
Can you provide me direction as to what to do.
Sincerely,
Don Barar
Posted : 06/08/2025 11:13 am
IO errors are "communication errors", not necessarily disk errors. the only way to "clear" the errors is in the SoftRAID utilities menu. They are saved to the disks partition maps, so SoftRAID remembers them.
My guess is whatever triggered that one disk to hang/fail to read a sector, made "noise" on the bus and triggered the other IO errors.
My recommendation is:
Update your backups.
clear all IO counters on the disks
"Validate" the volume. Hopefully it will complete. This will update all parity data.
I would then (only if the RAID shows failed still), "recover failed disks", and decline to validate when prompted.
Now, I would "split" the disk with unreliable sectors and then "certify the disk" and see if it is fixed, or reallocates, in which case it should be replaced.
Let us know how it turns out.
Posted : 06/08/2025 6:53 pm
