On Thu, Jan 7, 2021 at 7:52 AM Patrick O'Callaghan <pocallag...@gmail.com> wrote: > > On Thu, 2021-01-07 at 21:33 +0800, Qiyu Yan wrote: > > > and the space usage doesn't seem to have changed. > > Try using compsize to get space usage? > > # compsize /home > Processed 373221 files, 936531 regular extents (1058479 refs), 155981 > inline. > Type Perc Disk Usage Uncompressed Referenced > TOTAL 98% 1.1T 1.1T 1.0T > none 100% 1.1T 1.1T 1013G > zstd 46% 17G 38G 40G
And are there any new subvolumes you've created below /home? Those are not subject to -r, the defragment will stop at subvolume boundaries. Any VM images? If they're nodatacow, they won't compress. And quite a lot of media files will not compress because they're already compressed. Based on the above numbers I don't think this is as likely the issue but mention it anyway: Are there any snapshots? 'btrfs fi defragment' is not snapshot aware and will split up shared extents (makes them exclusive again, increasing space consumption). Lower priority, more experimentation, purely anecdotal: Using zstd:1 might result in faster writes to SSD; where zstd:3 (same as zstd) might result in faster overall writes to HDD. For Fedora 34 the proposal is 'compress=zstd:1' and that's a bit conservative but also is low hanging fruit with the biggest gain for the effort. Folks who don't care about performance or want to use this for archives can experiment with even higher values. I tend to use zstd:7 on backups. It does get quite slow eventually, around 11 or higher. But zstd is fairly invariant to compression level on reads, as in I doubt anyone can tell a difference on read between a file that was compressed with 1 vs 9, and maybe not notice 15 unless they were paying attention or timing it. -- Chris Murphy _______________________________________________ users mailing list -- users@lists.fedoraproject.org To unsubscribe send an email to users-le...@lists.fedoraproject.org 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/users@lists.fedoraproject.org
