Hello folks - I was transferring three movie files from my desktop PC to my array when the transfer failed on the last file. I checked the unRAID Main page and saw that there were some errors displayed by the Notification tool. See picture below.

 

I then tried to capture Diagnostics as requested but the process hung. I left it for 20 minutes but nothing was generated. I then looked at the Dashboard and saw the CPU pegged at 100% on all 4 cores.

 

I clicked Stop Array and left it for another 10 minutes but nothing happened. I tried to Shut Down the array but nothing happened. The only option left was a Forced Shutdown from the power switch. I am aware this will probably have lost all the logs from the situation that caused the error.

 

I took the server into the other room and attached a monitor and turned the server back on. The SAS card found all drives with no warnings. The unRAID command prompt appeared exactly as expected with no errors displayed so I looked at the Dashboard on my browser. The notifications about the errors were gone of course (with a new complaint that it could not see the UPS).

 

Now I am aware that I had been disturbing the SAS-SATA leads during my recent rebuild but my concern now is how to check the HDDs for failure warnings and how to recover the data on the array. The current situation is that the array is stopped and has some files in the cache which I do have local copies of.

 

Please can you advise on the health of the array and the steps I should take to check and recover it. My array is dual parity, 5 data, cache pool. All drives are under warranty.

 

Thanks.

nas-plex-diagnostics-20181026-0705.zip

Edited October 27, 20187 yr by DanielCoffey

Likely a problem with the miniSAS cables connected to those disks, check/replace cable and if the emulated disk1 is mounting correctly you can rebuild it and re-sync parity at the same time to get the array back to healthy.

Thank you for the quick reply.

 

I have re-seated all the SAS-SATA cables and Started the array. It came up without warnings so I started a Read Check. I got a green notification saying "Notice [NAS-PLEX] - array turned good. Array has 0 disks with read errors" and it is now starting a read check.

 

On the assumption that it finishes properly, I will report back in a day and mark the thread as solved.

23 minutes ago, DanielCoffey said:

so I started a Read Check

You can do that to make sure all is good before rebuilding but you'll still need to rebuild the disable disk and re-sync parity.

Which menu is the Rebuild on? When I looked on the Main page I saw that the Parity Check button had been replaced with the Read Check so I assumed that was where I had to start.

 

I currently have Data 1 and Parity 1 emulated.

You need to re-enable both disks, you can do both at the same time, follow these instructions:

https://wiki.unraid.net/Troubleshooting#Re-enable_the_drive

Got it, thanks. It is now doing the rebuild. Assuming all is well, I'll report back and update.

Quick question... the Rebuild is progressing nicely but I have just remembered that there are files on the cache that were due to be moved to the array. The array will still be building when that next schedule falls due.

 

Is the scheduled cron job for Mover suspended while the array is being rebuilt?

Just now, DanielCoffey said:

Is the scheduled cron job for Mover suspended while the array is being rebuilt?

Not automatically, you can change the schedule now, it won't break anything if it runs during the rebuild, but it will slow it down.

Cheers - I've set it to run in a few days time so the rebuild will complete first. I'll set it back to the normal schedule once I am protected.

There we go - all resolved, thank you. Array is rebuilt and protected again.

 

Just under 20h30 for a Rebuild and Parity pass of 8Tb. Regular Parity check comes in at between 17h40 and 18h20.