fstrim
SSD TRIM command issuer
TLDR
Trim all mounted partitions
$ sudo fstrim -a
Trim specific partition$ sudo fstrim /
Trim with verbose output$ sudo fstrim -v /
SYNOPSIS
fstrim [OPTIONS] mountpoint
DESCRIPTION
fstrim discards unused blocks on a mounted filesystem, sending TRIM commands to the underlying storage device. This is primarily useful for SSDs and flash storage to maintain performance and extend device lifespan.
PARAMETERS
-a, --all
Trim all mounted filesystems that support discard-v, --verbose
Display number of bytes trimmed-n, --dry-run
Print what would be done without actually trimming-o, --offset offset
Byte offset in filesystem to start trimming-l, --length length
Number of bytes to trim after offset-m, --minimum size
Minimum contiguous free range to trim
CAVEATS
Only works on filesystems whose underlying storage supports discard (most SSDs, NVMe, thin-provisioned devices). Running too frequently provides no benefit; a weekly schedule via the fstrim.timer systemd unit is typical. Continuous discard mount option is an alternative but generally less efficient than periodic fstrim.
HISTORY
fstrim is part of the util-linux package, providing TRIM support for SSD optimization on Linux systems.
SEE ALSO
blkdiscard(8), mount(8)
