Hey everyone.

I swapped from Server Hardware to "more efficient" hardware some month ago. Since then every 1-3 days my logs are written full of errors and I need to restart Unraid. I don't see any problems other then the full log.

Of course I checked the log and it seems like there is some problem with my M.2 Drive or maybe with my Mainboard/M.2. I remember I wasn't sure when I ordered the Mainboard if it is able to use the full Bandwidth of the M.2.

 

Repeating Error: 

Jun 20 00:30:54 Zeus kernel: print_req_error: I/O error, dev loop2, sector 4975992
Jun 20 00:30:54 Zeus kernel: BTRFS error (device loop2): bdev /dev/loop2 errs: wr 5414, rd 0, flush 1, corrupt 0, gen 0
Jun 20 00:30:54 Zeus kernel: loop: Write error at byte offset 2773131264, length 4096.

Mainboard: ASRock Mainboard X470D4U2-2T Sockel AM4 mATX
SSD: Some WD M.2 that came with my Laptop.. But SMART stats seem to look ok. I want to upgrade to another one anyway soon and put this one back in my Laptop.

Also is there an unassigned SSD for VM's but I think this should not be a problem (It's the old cache drive)
CPU: Ryzen 7 3700X
RAM: 2x 16GB (1x 16384MB) Crucial CT16G4WFD8266 DDR4-2666 ECC DIMM CL19 Single

Maybe someone can help me, its sad that I can't rely on my Server at the moment.
Thanks in advance.

zeus-diagnostics-20200620-0016.zip

Edited June 20, 20206 yr by Nxt97
changed ram count

There's filesystem corruption on cache, best bet is to backup, re-format and restore cache data.

On 6/20/2020 at 8:28 AM, johnnie.black said:

There's filesystem corruption on cache, best bet is to backup, re-format and restore cache data.

Thanks everything is looking good for now.

 

If somone else got the problem, this is what I did:

 

 

• Disable the Docker under Settings->Docker->EnableDocker
• Disable the VM Manager under Settings->VM Manager->EnableVMs
• Backup Cache Drive:

/usr/bin/rsync -avrtH --delete /mnt/cache/ /mnt/(SOMEDISK)/cache_backup >> /var/log/cache_backup.log

• Format Disk:
  • Stop Array
  • Under Main -> Cache
  • Change "File system type:" to something different
  • Start array
  • Under the stop array button you should find a format button -> format disk
  • Stop array
  • Change "File system type:" back to the old value
  • Start array
  • Format again
  • Done
• Restore Cache Disk:

/usr/bin/rsync -avrtH --delete /mnt/(SOMEDISK)/cache_backup /mnt/cache/ >> /var/log/cache_backup2.log

DONE

Edited June 22, 20206 yr by Nxt97
changed code highlighting

Thanks for write up, and if you don't mind going to mark this as solved.

Thanks for this guide @Nxt97!

I had the same problem with 2 Sata SSD's as a BTRFS Cache Pool. 

For Unraid 6.8.3 I recommend the Unassigned Devices plugin to remove the old formatted partitions on the cache disk(s). 

So you:

• Do al the 3 steps Nx97's post mentions (disable VM Manager and Docker and start the rsync backup command)
• stop the array,
• deselect the SSD'(s) under Main -> Cache and it/they appear in the Unassigned Devices list below.
• Click on the plus sign [+] on the disk(s) in that UD list and it wil fold out showing the partition in it, which you can
• remove by pressing the Remove button. 
• Confirm removal of partition with typing "Yes" and press Confirm. 
• Reassign the disk(s) to the Cache Pool and
• start the Array. (Might be that you need to select the Yes checkbox on the right side)
• Format the Cache Disk/Pool by clicking the format Cache button that will be available to after the Array has started. 
• Restore with the rsync commando mentioned in Nxt97 post after the formatting.