Re: Fixing a corrupted file system

[Ulli Horlacher <framstag@rus.uni-stuttgart.de>]

On Thu 2026-04-02 (21:07), Forza wrote:

> > I forget what mkfs version, but the default behaviour changed a few years ago so the default profile is Single on SSD's. (Correct me if this has since been reverted.)  Something about the way SSD's copy on write, the DUP entries would end up on the same physical block, so the redundancy was not effective.
> 
> It is the reverse. Since btrfs-progs 5.15, the default was changed to DUP for single device fs.
> 
> https://github.com/kdave/btrfs-progs/commit/65181c273e67bd48d01fc79f00826dce38b93c4c

I have some old btrfs filesystems with single metadata:

root@moep:~# btrfs filesystem df /
Data, single: total=23.01GiB, used=12.51GiB
System, DUP: total=8.00MiB, used=16.00KiB
Metadata, DUP: total=1.75GiB, used=930.19MiB
GlobalReserve, single: total=42.06MiB, used=0.00B

root@moep:~# btrfs filesystem df /home
Data, single: total=95.01GiB, used=54.27GiB
System, single: total=32.00MiB, used=16.00KiB
Metadata, single: total=1.00GiB, used=293.70MiB
GlobalReserve, single: total=80.53MiB, used=0.00B

(How) can I convert /home to DUP for System and Metadata?
(/ looks good)

-- 
Ullrich Horlacher              Server und Virtualisierung
Rechenzentrum TIK
Universitaet Stuttgart         E-Mail: horlacher@tik.uni-stuttgart.de
Allmandring 30a                Tel:    ++49-711-68565868
70569 Stuttgart (Germany)      WWW:    https://www.tik.uni-stuttgart.de/
REF:<87d1aca.ae41f579.19d4f977d95@tnonline.net>