Use trim command for SSD under linux

Modify /etc/fstab

Add discard options in /etc/fstab as below

UUID=2741f09c-7667-4b4a-88da-f2db826c12345 /               ext4    defaults,discard,noatime,nodiratime,commit=600,errors=remount-ro   0       1

Use command to trim SSD

# fstrim -a -v
  /: 811.9 GiB (871748583424 bytes) trimmed

Ref : Debian SSDOptimization