Hello everyone, I would be really greatful if anyone has some advice for me here - I already checked quite many forum posts and the docs but could not fix things - the issue:

- My only cache disk shows "Unmountable: Unsupported or no file system" (no additional warnings on the Main Page)

- I do have 3 additional Disks (see screenshot), which are non-problematic:

- It runs btrfs (on /dev/nvme0n1p1)

- The following commands did not help:

root@RyzenServer:~# btrfs rescue zero-log /dev/nvme0n1p1
Clearing log on /dev/nvme0n1p1, previous log_root 45887504384, level 0
ERROR: failed to write super block for devid 1: flush error: No data available
ERROR: failed to write dev supers: No data available
WARNING: fsync on device 1 failed: No data available

and

root@RyzenServer:~# btrfs rescue super-recover /dev/nvme0n1p1
All supers are valid, no need to recover

 

Furthermore, I am now starting to try to restore everything: sudo btrfs restore -iv /dev/nvme0n1p1 /mnt/disk1/Backup-Data/cache_disk

 

Funnily enough, the btrfs check does not output any problems:

root@RyzenServer:~# btrfs check /dev/nvme0n1p1
Opening filesystem to check...
Checking filesystem on /dev/nvme0n1p1
UUID: 756f823b-c701-4391-9d73-27122e342f7c
[1/7] checking root items
[2/7] checking extents
[3/7] checking free space tree
[4/7] checking fs roots
[5/7] checking only csums items (without verifying data)
[6/7] checking root refs
[7/7] checking quota groups skipped (not enabled on this FS)
found 391609741312 bytes used, no error found
total csum bytes: 160518816
total tree bytes: 885686272
total fs tree bytes: 302432256
total extent tree bytes: 337625088
btree space waste bytes: 205524097
file data blocks allocated: 3900642582528
 referenced 348404584448

 

If the cache-disk is hardware-faulty, is there a simple way to restore?

 

Please help, I really have to get my docker containers and VMs back, you would definitely make my day...

ryzenserver-diagnostics-20240726-0108.zip

Edited July 25, 20241 yr by Martin Dallinger

=== START OF SMART DATA SECTION ===
SMART overall-health self-assessment test result: FAILED!
- media has been placed in read only mode

 

Cache device failed, you will need to replace it, you may be able to mount the fs in read-only mode:

https://forums.unraid.net/topic/46802-faq-for-unraid-v6/?do=findComment&comment=543490

 

Thank you for your quick reply - mounting in ro-mode works, I now have the issue that I do not have a new cache-disk lying around for now and I could not find anything on how I could get my system back up and running - could you maybe give me a few hints/commands on how one would push the recovered cache disk-data to the array?, I am worried about overwriting something I should not...

You can use for example midnight commander (mc on the CLI) or the Dynamix file manager to copy the data elsewhere.