This may not strictly be a QNAP issue, but I’m sure there are people here who can assist.
Device: TS-453Be running QTS 5.2.10.3577 in RAID 5
Twice now in its scheduled monthly S.M.A.R.T. testing one of the disks (WD Red) has failed instantly with the scary-sounding message “fatal or unknown error”. The first time, I initiated the test manually and it completed without problems.
The next month the same drive failed again with the same message. This time it took four or five attempts to start the test manually.
How worried do I need to be? The disk is almost eight years old so I guess I’ve had my money’s worth out of it.
Edit: “Disk health” otherwise shows as OK, and on the DA Drive Analyzer it shows as “healthy”.