Hi,

In the last week, I have had muiltiple disks that started having errors, but SMART tests and pre-clears are not identifiying issues.

It started last week when I add an old hard drive to the array (that was fine on pre-clear and SMART). I assumed it was just an issue with an old drive (circa ~7-9yrs old) so removed it and then added a warm spare into its place. Same issue occured on the 'spare' (parity didnt findih rebuild, device disbaled and emulated) so purchased a new drive and this worked fine (in the same bay and cables as the first drive that had issues) and parity was re-synced around Fri/Sat and then Sunday the Parity drive recorded issues. The issues appear to occur when Mover is running (9am daily), but this is about all that writes to the Array (the rest are ZFS cache pools).

Below is an example from today after restarted the server and then attempting to rebuild parity. Keen to understand what might be at play.

Alert message:
Parity disk - WDC_WD101EFBX-68B0AN0_VH1U7Z0M (sdg) (errors 1024)

Disk Log info has "synchronise cache(10) failed" and then the drive is diabled.


To check it was not a one-off error I restarted the server, removed the disk and then re-added it back to start a parity rebuild and it hit the same error.

Full diagnostics and (short) SMART report attached.

I have swaped the old 'parity' drive with the 'spare' drive that had issues last week - I have put in a new bay with different cables to see if that could be at play. I am also running an extend SMART test on the old parity drive now its unassigned.

vault-diagnostics-20250526-1026.zip WDC_WD101EFBX-68B0AN0_VH1U7Z0M-20250526-1221.txt

Disk dropped offline and reconnect again, this is typically a power/connection issue, check/replace cables and try again.