fstrim.timer unit is now enabled by default for new installations and upgrades. The unit weekly runs the
fstrim tool, which sends the
TRIM command to all mounted file systems that are listed in the
TRIM command informs physical and virtual storage devices about unused blocks. This has the following effects:
The hinting can make wear leveling and block erasure more efficient.
TRIMreturns free logical extents on LVM thin provisioning to the thin pool.
TRIMprevents the slow downs that might occur in certain flash storage devices.
For details about the
TRIM command and the
fstrim tool, see the
fstrim(8) man page.