Hi all,

My system has a fault some where. Been having an issue the last few days and I am not sure what to do. This is a secondary NAS.

Context:

In June one of my drives was throwing a lot of errors. I replaced that drive and everything seems to be running fine. Three or four days ago parity check started and I noticed that the hardware was making a beep and the HD light on the front was blinking at the same time. The parity sync was also showing an incredible long completion time. After a few restarts after some attempts to boot in safe mode and disable docker / vms the new drive showed as unreadable and unraid offered the format option. When I did this parity build was not offered so I believe this data is now lost. After a few days of fiddling with it I am not sure where to go so hoping somebody can help.

I have included some screenshots, a video, and the diagnostics log.

1. When I run a parity check my unraid box starts making a beep every 5 to 7 seconds, I do not think this is a motherboard beep as it's short and quiet.

2. The parity check.

   1. The check is extremely slow.

      1. 

   2. I looked at history and saw there were errors. I had automatic parity error correction on until last month.

      1. 

3. Finally after a few restarts upon one boot a drive was marked as unreadable and required formatting. When I formatted there was no parity rebuild option so I'm assuming that data is now gone forever. Is this a normal thing? Did I do this procedure wrong?

kms2-diagnostics-20250706-0735.zip

Replace cables for disk3, power and SATA, then try again.

On 7/6/2025 at 8:32 AM, JorgeB said:

Replace cables for disk3, power and SATA, then try again.

Hey JorgeB, replaced the SATA & power cable. I just started a parity check and speeds are looking correct now. Should I wait until the check is complete before I can confirm this issue is fixed? I have the write corrections to disk during parity check off will this not fix parity errors?

Should be resolved but you can wait until it finishes.

Alright thank you! I have one other question if you don't mind. When I reformatted the disk that had the bad cable unraid never prompted me for a parity rebuild. What steps would I have had to take to have parity rebuilt? I want to avoid data loss in the future if I end up in a situation like this again.

1 hour ago, kernelpaniced said:

When I reformatted the disk that had the bad cable unraid never prompted me for a parity rebuild

This is to be expected. As far as Unraid is concerned a format is just another sort of write operation and it updates parity just like it would for any other write operation.