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Cache: Unmountable: Unsupported or no file system

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After rebooting, my cache drives (formatted btrfs) are showing Cache: Unmountable: Unsupported or no file system.

My diagnostics file is attached. Any help would be greatly appreciated!

jupiter-diagnostics-20250713-2237.zip

  • Community Expert

Post the output from btrfs fi show

  • Author

Thanks for the reply. Attached is the output.

Screenshot 2025-07-14 at 6.01.32 AM.png

  • Community Expert

No btrfs filesystem is being detected; post the output from

fdisk -l /dev/sde

fdisk -l /dev/sdf

  • Author

Here is the output for both disks. Since there is no filesystem detected, will it even be possible to recover the data from my VM and Dockers?

Screenshot 2025-07-14 at 7.22.56 AM.png

Edited by baero

  • Community Expert

The partitions are missing, any idea what happended there?

Type sfdisk /dev/sde and enter, then type 2048 and enter again, post the output from that, don't do anything else for now.

  • Author

The server was working fine - had a power outage a few days ago but the server came back all okay and has been working fine daily since. I restarted last night to add another drive and got a "bzmodules checksum error" message. I replaced the bz* files on the USB drive and it booted right now, but now the cache is missing.

Here is the output from sfdisk

Screenshot 2025-07-14 at 8.35.22 AM.png

  • Community Expert

Hit CTRL + C to abort and repeat the command, but with 64 instead of 2048, then post output again after

  • Author

Here is the output

Screenshot 2025-07-14 at 8.48.58 AM.png

  • Community Expert

Not sure what happened to the SSDs, but there's no previous filesystem signature detected on the two possible sectors Unraid uses. If the partitions were just wiped, this would bring them back, so I'm afraid that the only option to try and recover the data would be a deleted file recovery app, like UFS explorer, the free trial should show what it can recover.

  • Author

Ok, I will give that a try. Thank you for all the help, I really appreciate it!

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