ssd-trim

#!/usr/bin/env bash
# --------------------------------------------
#
# Detect ext4 devices and start trim for SSD
#
#  Revision history :
#   10/04/2014 - Creation by N. Bernaerts
# --------------------------------------------

# set PATH
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin

# list all mounted devices into an array
LST_DEVICE=`mount | grep "^/dev/" | grep "ext4" | cut -d" " -f1,3  | sed 's/ /|/g'`
read -a ARR_DEVICE <<< $LST_DEVICE
     
# loop thru the selected devices to check if trimming needed
for DEVICE_DATA in "${ARR_DEVICE[@]}"
do
  # get current device data
  DEVICE_PATH=`echo $DEVICE_DATA | cut -d"|" -f1`
  DEVICE_MOUNT=`echo $DEVICE_DATA | cut -d"|" -f2`
     
  # check if device accepts trim command
  DEVICE_TRIM=`hdparm -I $DEVICE_PATH | grep "TRIM supported"`
  if [ "$DEVICE_TRIM" == "" ] ;
  then
    # trim not supported
    logger "$DEVICE_PATH : trim not supported"
  else
    # trim supported
    logger "$DEVICE_PATH : trim started on $DEVICE_MOUNT"
    logger "$DEVICE_PATH : `fstrim -v $DEVICE_MOUNT`"
  fi
done