Last parity check was without issues.

 

• Unraid 6.9.2 - running for a couple of months.
• 1x18TB parity drive
• 1x18TB and 2x14TB data drives
• No hardware changes since last parity check.

 

What happened:

• After running the parity check for a while, I noticed the amount of errors - in the millions and running up between Parity and Disk 1.
• Paused the parity check.
• Read errors on the parity drive kept running up.
• They seemed to run up continuously.
• One disk (one of the 14TB) also shows UDMA CRC error count 1.
• Some of my shares already show as empty or with much reduced content, although they shouldn't be.

 

At this point, I am not sure what to do but slightly panicking. Could this be an issue with the SATA controller? Why would it develop suddenly? Ambient temperatures are relatively low.

Also, is there any way to recover data and/or prevent further data loss?

 

 

Edited October 19, 20214 yr by SmoothMuffin
removed diagnostics for privacy reasons after resolution

It appears that disk1 has dropped offline as there is no SMART information for it in the Diagnostics.   This will be what is causing the parity errors.  It will also explain why you cannot see all your data.

 

you will probably need to power cycle the server to see if you can get disk1 back online.   After doing so post new pDiagnostics.

Thanks for the quick answer!

Ufff, I didn't quite realise that Disk 1 was not even showing temperature anymore..

 

I stopped the array, shutdown (this did not do anything, so I tried powerdown via the GUI bash). GUI went offline, but server stayed on, so I held the Power for 3+ seconds.

Opened up the server and it seemed mostly fine. Maybe one of the power cables came loose?

 

Now, back up, parity checking without errors and the shares are back. Let's see what happens, but it looks good so far!

Thank you again!