Chapter 5. Trim options on an LVM-VDO volume
Chapter 5. Trim options on an LVM-VDO volume The following are different available trim options for an LVM-VDO volume: discard Performs online block discard operations to automatically discard unused blocks. For immediate discarding, use the mount -o discard command. fstrim Performs periodic discarding. The admin needs to schedule and monitor an additional process. Note It is currently recommended to use fstrim application to discard unused blocks rather than the discard mount option because the performance impact of this option can be quite severe. For this reason, nodiscard is the default. 5.1. Enabling discard mount option on an LVM-VDO volume You can enable the discard option on your LVM-VDO volume. Prerequisites An LVM-VDO volume exists on your system. Procedure Enable the discard option on your volume: Additional resources xfs(5) , mount(8) , and lvmvdo(7) man pages on your system 5.2. Setting up periodic TRIM operation You can enable a scheduled TRIM operation on your system. Prerequisites An LVM-VDO volume exists on your system. Procedure Enable and start the timer: Verification Verify that the timer is enabled: Note You will not see any reference to a VDO volume, because the fstrim.timer runs across all mounted file systems. Additional resources fstrim(8) man page on your system
mount -o discard /dev/ vg-name/vdo-name mount-point systemctl enable --now fstrim.timer systemctl list-timers fstrim.timer NEXT LEFT LAST PASSED UNIT ACTIVATES Mon 2021-05-10 00:00:00 EDT 5 days left n/a n/a fstrim.timer fstrim.service