Unmount and spin down all scsi devices

shutscsi.sh

#!/bin/sh
#
# Shutscsi v0.1 - Unmount and spin down all scsi devices
# @author: Walter Purcaro <[email protected]>
#
###############################################################################
#
# This script needs fuser and sdparm softwares to run correctly.
# Install psmisc and sdparm packages to get them.
#
# Don't forget to execute as root!
#
###############################################################################
#
# Ignore devices
# Ex.: IGNORE="abc" (to ignore sda, sdb, sdc device)
IGNORE=""
#
# Kill all processes even if device is not busy
KILL=0
#
# Force unmount sending SIGKILL
FORCE=0
#
###############################################################################


# Declare log function
log(){
    #echo "$1"
    case "$2" in
      "EMERG")    E=0;;
      "ALERT")    E=1;;
      "CRITICAL") E=2;;
      "ERROR")    E=3;;
      "WARNING")  E=4;;
      "NOTICE")   E=5;;
      "INFO")     E=6;;
      "DEBUG")    E=7;;
      *)          E=6;;
    esac
    logger -i -p $E -t "Shutscsi" "$1"
}


# Check software dependencies
packages="awk df echo fuser grep logger sed sort sdparm umount"

for dep in $packages
do which "$dep" || log "Package $dep not found!" CRITICAL && EXIT=1
done
[ $EXIT -eq 1 ] && exit 2


# Get devices to unmount
fss="$(df | grep -e "^/dev/sd" | awk {'print $1'})"
[ -z "$fss" ] && log "No scsi devices found mounted! Exit now." && exit 0

if [ -n "$IGNORE" ]
then
  pn="$(echo $IGNORE | sed -e 's/ //g' | grep -o "." | awk {'print tolower("^/dev/sd"$1"|")'})"
  excpn="$(echo -n "${pn%?}" | sed -e 's/ //g')"
  fss=$($fss | grep -ve "$excpn")
fi


# Start umount loop
for device in $(echo "$fss" | sed -e 's/[0-9]*//g' | sort -u)
do
  SPINDOWN=1

  # Try to unmount filesystems on the pool
  for fs in $(echo "$fss" | grep -e "^$device")
  do
    umountfs=$(umount "$fs")

    # First try to unmount directly
    $umountfs

    # Go to the next filesystem if unmount succeeds and KILL argument was not set
    if [ $? -ne 0 -o $KILL -eq 1 ]
    then
      # Kill processes keeping busy current filesystem
      fuser -mk -signal SIGTERM "$fs"

      # Force killing if previous task fails and FORCE argument was set
      [ $? -ne 0 -a $FORCE -eq 1 ] && fuser -mk -signal SIGKILL "$fs"
        
      # Retry unmount
      $umountfs
    fi

    # Exitcode
    if [ $? -ne 0 ]
    then
      log "Unable to unmount busy filesystem $fs" ERROR
      SPINDOWN=0
    else
      log "Successfully unmounted filesystem $fs" DEBUG
    fi
  done

  # Spin-down device if all its filesystems was sucessfully unmounted
  if [ $SPINDOWN -eq 1 ]
  then
    log "Spinning down device $device"
    err="$(sdparm --flexible --command=stop --quiet "$device" 2>&1)"
    [ $? -ne 0 ] && log "$err" ERROR
  else
    log "Spin-down not performed for device $device" ERROR
  fi
done

exit 0