FSTRIM(8) System Administration FSTRIM(8) (NAME) fstrim - (SYNOPSIS) fstrim [-v] [-o offset] [-l length] [-m minimum-size] -A|-a|mountpoint (DESCRIPTION) fstrim ( <> ) . (SSD) thinly-provisioned . fstrim . . mountpoint -A -a --fstab --all . fstrim mount -o discard SSD . . (queued trim) . (OPTIONS) offset length minimum-size KiB (=1024) MiB (=1024*1024) GiB TiB PiB EiB ZiB YiB ( <> <> <> ) KB (=1000) MB (=1000*1000) GB TB PB EB ZB YB. -A, --fstab /etc/fstab discard . . --offset --length --minimum . discard autofs . <> . -a, --all discard . --offset --length --minimum . discard . -n, --dry-run ioctl FITRIM . -o, --offset offset . . -l, --length length ( ) . fstrim . . -I, --listed-in list (:) fstab mountinfo . . list . : --listed-in /etc/fstab:/proc/self/mountinfo. <> fstab . -m, --minimum minimum-size . ( .) fstrim (fstrim_range.minlen) . fstrim . . -t, --types list --all --fstab . list . list mount -t . . <> <> . ( <>) . -v, --verbose . fstrim . ioctl FITRIM . fstrim . stripe RAID trim LVM . fstrim_range.len ( --length) . --quiet-unsupported (ioctl) . systemd cron(8) Bad file descriptor NTFS ioctl FITRIM. fstrim . -h, --help . -V, --version . (EXIT STATUS) 0 1 32 64 fstrim --all 0 ( ) 32 ( ) 64 ( ) . (AUTHORS) Lukas Czerner , Karel Zak (SEE ALSO) blkdiscard(8), mount(8) (REPORTING BUGS) . (AVAILABILITY) fstrim util-linux . . util-linux 2.41.5 2026-06-16 FSTRIM(8)