Hi.

I have updated my server after waiting for too long to 7.0.1 (and now to 7.1.4 in hopes of fixing it). I've ran into this issue:

Unmountable: no filesystem found

Things I have tried:

• Went through a full rebuild

• My filesystem is BTRFS so I did a filecheck, repair, scrub

• Removed from array, started, added again

• Swapped out harddrive with a new precleared drive

• [1/8] checking log skipped (none written)

  [2/8] checking root items

  [3/8] checking extents

  [4/8] checking free space tree

  [5/8] checking fs roots

  [6/8] checking only csums items (without verifying data)

  [7/8] checking root refs

  [8/8] checking quota groups skipped (not enabled on this FS)

  Opening filesystem to check...

  Checking filesystem on /dev/md8p1

  UUID: f6f83605-5760-46fa-bf40-681e4e6ed91c

  found 7802044518400 bytes used, no error found

  total csum bytes: 7610385748

  total tree bytes: 9009512448

  total fs tree bytes: 95879168

  total extent tree bytes: 147767296

  btree space waste bytes: 1088064272

  file data blocks allocated: 7793035005952

   referenced 7793035005952
  

Can anyone help me any further?

tower-diagnostics-20250901-1703.zip

With the array started, post the output from:

wipefs /dev/md8p1

Despite the name, this won't wipe out anything as written.

What happens if you set the disk to btrfs filesystem manually instead of the "auto" setting?

add the disk to the array slot, pick the disk name, change fs from auto to btrfs, does that allow the disk to be mounted?

Was already on BTRFS. Tried setting to auto and then back to BTRFS, no luck. FYI for Jorge, since I answered this on discord :)

The problem is the multiple signatures, if you are sure that disk is using btrfs, type with the array still started:

wipefs -a -t xfs /dev/md8p1

Then restart the array; it should now mount, but if it doesn't, post new diags.

Hi Jorge,

Problem was solved. Rebuild started. I hope I won't have lost too many data rebuilding when it wasn't okay to rebuild.. Sent you a beer.

Thanks!

1 minute ago, Feganisto said:

I hope I won't have lost too many data rebuilding when it wasn't okay to rebuild

The disk not mounting doesn't affect the rebuild; all the data should be OK, assuming parity was valid and no errors occurred during the rebuikld.

Thanks for the beer money!

2 hours ago, MowMdown said:

What happens if you set the disk to btrfs filesystem manually instead of the "auto" setting?

Forgot to mention, that should always work with xfs and multiple signatures, but for some reason, it doesn't work with btrfs, will need to investigate why.