TerraMaster Forum

I have an F5-422 running TOS version TOS_X642.0_5.0.176
I have 5x 6TB drives in RAID 6 on a single 16.34TB storage pool.

The system reported the RAID is degraded, with alert message:
"The RAID in storage pool 0 have been downgraded! For the safety of your data, please repair the RAID as soon as possible."

I tried shutting it down, reseating the drive and restarting.
After the restart, the drive could be read as normal and the array rebuilt.

The drives are barely 3 years old and good quality (Western Digital WD60EFPX-EC) so it seemed unlikley one would fail, but I ordered a new one anyway as a precaution.

After a few weeks it happened again.
After a reboot, I could see all drive states reporting Good, but noticed HDD3 downgraded from 6.0 Gb/s to 3.0 Gb/s.

Tried rebooting again, and now HDD3 still had state Good, but was missing from the storage pool.
Tried to reseat it again but still HDD3 was missing from the storage pool, seemed offline and could not be read.

So I replaced HDD3 with the new one and restarted the system.
The new drive could be read, so I initiated a Repair RAID
( Control Panel > Storage Manager > Storage Pool -> Edit -> Repair RAID)

This rebuild ran for around 5~10 minutes and failed, with the same alert message:
"The RAID in storage pool 0 have been downgraded! For the safety of your data, please repair the RAID as soon as possible."
HDD3 status was reported good, but again after reboot was offline.

I repeated the process to check the new drive was seated well, with the same result
(this time it automatically started to rebuild but failed again after a few minutes).


So it seems that HDD3 slot is failing. Is there any diagnostics I can run to confirm this?

Is a repair / replacement possible?

Hi.
After replacing the HDD3, is there still a situation where the speed has dropped from 6.0 Gb/s to 3.0 Gb/s?
Please generate and download the system report package in TOS Desktop > Technical Support > Report Issues, then download and send it to us for inspection.

This may allows us to better and faster judge the problem and come up with a solution.
You can provide us with the system report by sharing a cloud drive link or a WeTransfer link.
Please send the sharing link to me via private message on the forum. Alternatively, you can also send the sharing link to the support email or the official website Live Chat. (Please note your forum nickname and the URL of this post)

After replacing the HDD3, is there still a situation where the speed has dropped from 6.0 Gb/s to 3.0 Gb/s?

Hi,

Currently I have shut the system down for safety. When I get home tonight (Japan timezone) I will start it up again.

Both the new disk and the old disk exhibit the same behaviour. Initially reported Good but after just a few minutes go offline. The disk can still be seen on the Hard Disk screen, but with no info (model, firmware version, speed, etc)... And can't be seen by the storage pool as an available drive.

I'll try to generate a report as soon as I start it up and can login and another after failure.