On Sun, Oct 5, 2025 at 9:53 PM Samuel Sieb <[email protected]> wrote:
> On 10/5/25 3:08 AM, Javier Perez wrote: > > Hi. > > > > George N. White III wrote in a post something that resonated with me. > > > > A lot of effort has gone towards improving the default > > configuration, (but > > now new problems for users who don't do btrfs maintenance and end up > > with > > broken filesystems). It is assumed that users going outside the > > defaults > > > > > > Is there any link, tutorial, etc that explains what kind of btrfs > > maintenance we are supposed to be doing? > > Long time btrfs user and have never knowingly performed any maintenance > > on my btrfs filesystem except balancing after converting from single HDD > > to raid 1 my system. > > I wonder what I have been missing (ignorance is bliss :( ) > > There's nothing you need to do. If you're using the RAID functions of > btrfs, then a regular scrub could be a good idea, just like mdraid does. > I guess even if it's a single drive, a scrub would be useful to detect > data corruption issues early, although you wouldn't be able to recover > the damaged data. But that's an extra thing that's enabled by the > filesystem feature of checksumming. It's not a necessary thing. > Early detection of bitrot is important -- you may have used invalid data in further processing, no longer have access to the original data, or may discover a corrupt file just before a deadline. Some people run out of space for btrfs metadata: < https://www.ordinatechnic.com/blog/1/Filesystems/2/Btrfs/not-enough-space-on-btrfs-filesystem-due-to-exhausted-metadata-block-group-allocation>. The fix may require adding space to allow balancing. Fedora has `systemctl enable *btrfs*-*balance*.timer` to automate -- George N. White III
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