On Wed, Oct 22, 2025, at 10:08 PM, home user via users wrote: > (Fedora-42 workstation) > > Following what's said here: > "https://wiki.archlinux.org/title/Btrfs#Disabling_CoW"; > and here: > "https://unix.stackexchange.com/questions/635661/how-to-prevent-btrfs-compressing-var";, > I'm trying to turn off copy-on-write and compression on "/home".
Why do you want to turn off COW on /home? I can see turning off compression but why COW? This will disable data checksums too. You can add "chattr +C" to all directories, perhaps someone more clever than I am, can come up with a find command to look for directories and execute a chattr +C on them. New files will then inherit nodatacow thus nodatasum and no compression. It's not exactly something I'd advise though. If you don't want compression just remove the mount option from /etc/fstab - note it needs to be removed from the / line, since that line is really a "remount" and is what applies compression file system wide. The compression option on /home is just an artifact of the installer. There isn't per subvolume compression as a mount option. > I'm logged in as "root"; I'm in "/root". > I moved the original /home aside to /home_old. > I created a new "/home". > I turned off copy-on-write. How did you do this? > But when I try to turn off compression, I get this: > - - - - - - > bash: chattr +m /home > chattr: Invalid argument while setting flags on /home I'm not sure if this attribute is supported on directories or subvolumes. Someone with better Linux history knowledge than I will need to discuss the origin of file attributes. I think it was originally an ext2 thing? I'm not sure xfs uses any of them, off hand. -- Chris Murphy -- _______________________________________________ users mailing list -- [email protected] To unsubscribe send an email to [email protected] Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/[email protected] Do not reply to spam, report it: https://pagure.io/fedora-infrastructure/new_issue
