diff --git a/check_mdstat.sh b/check_mdstat.sh
index 52488df..9050cf6 100755
--- a/check_mdstat.sh
+++ b/check_mdstat.sh
@@ -1,47 +1,204 @@
 #!/bin/bash
 #
 # Created by Sebastian Grewe, Jammicron Technology
-# Changes By Jasem Elayeb on 02.03.2016
+# Changes by Jasem Elayeb on 02.03.2016
+# Chagnes by Jonny007-MKD on 06.02.2020
 # JE: add Physical Disks Name RAID_DISKS
 # JE: add Physical Disks Status DISKS_STATUS
 # JE: add Array Names RAID_ARRAY
+# J007: Only check a single array
 
-# Get count of raid arrays
-RAID_DEVICES=`grep ^md -c /proc/mdstat`
 
-# Get count of degraded arrays
-RAID_STATUS=`grep "\[.*_.*\]" /proc/mdstat -c`
+if [ $# -lt 1 -o -z "$1" ]; then
+	echo "ERROR: pass raid name as argument"
+	exit 1;
+fi
+while [[ $# -gt 0 ]]; do
+	case $1 in
+		-r|--raid)	TARGET_RAID_NAME="$2";;
+		-?|--help)
+			echo "Check /proc/mdstat. Arguments:"
+			echo "--raid NAME: Raid name, e.g. md0"
+			;;
+	esac
+	shift
+done
 
-# Is an array currently recovering, get percentage of recovery
-RAID_RECOVER=`grep recovery /proc/mdstat | awk '{print $4}'`
-
-# Is an array currently resyncing, get percentage of resync
-
-RAID_RESYNC=`grep resync /proc/mdstat | awk '{print $4}'`
-
-RAID_ARRAY=`awk '/md[1-9]/{for (i=1;i<=NF;++i) if ($i~/md[1-2]/)print $i}' /proc/mdstat |xargs`
-RAID_DISKS=`awk '/sd[a-z]/{for (i=1;i<=NF;++i) if ($i~/sd[a-z]/)print $i}' /proc/mdstat |xargs`
-DISKS_STATUS=`grep algorithm  /proc/mdstat|awk '{print $12}'`
-
-# Check raid status
-# RAID recovers --> Warning
-if [[ $RAID_RECOVER ]]; then
-        STATUS="WARNING - Checked $RAID_DEVICES arrays $RAID_ARRAY, recovering : $RAID_RECOVER"
-        EXIT=1
-# RAID resync --> Warning
-elif [[ $RAID_RESYNC ]]; then
-        STATUS="WARNING - Checked $RAID_DEVICES arrays $RAID_ARRAY., resyncing : $RAID_RESYNC"
-        EXIT=1
-# RAID ok
-elif [[ $RAID_STATUS  == "0" ]]; then
-        STATUS="OK - Checked $RAID_DEVICES arrays $RAID_ARRAY."
-        EXIT=0
-# All else critical, better save than sorry
-else
-        STATUS="CRITICAL - Checked $RAID_DEVICES arrays $RAID_ARRAY, $RAID_STATUS have FAILED"
-        EXIT=2
+if [ -z "$TARGET_RAID_NAME" ]; then
+	echo "ERROR: pass --raid as argument"
+	exit 255
 fi
 
-# Status and quit
-echo -e "$STATUS \n Physical Disks: $RAID_DISKS Disks Status: $DISKS_STATUS "
-exit $EXIT
+function log {
+	local x=
+	#echo "  > $@"
+}
+
+CURRENT_RAID=	# string
+function setCurrentRaid {
+	# This function is called for each line in $1
+	# If the line does not start with a whitespace, it denotes a new RAID device and CURRENT_RAID is set
+	# Also, the state and the devices are parsed 
+	local line="$1"
+	if [[ $line =~ ^[^\s].+:.+ ]]; then
+		local x1="${line%:*}" # Remove : suffix
+		local x2="${x1% *}"   # Trim right
+		CURRENT_RAID="$x2"
+		log "SET CURRENT RAID"
+	fi
+	log "CURRENT RAID: $CURRENT_RAID"
+}
+
+STATE=		# "active", "started", "inactive"
+LEVEL=		# int
+DEVICES=	# strings separated by whitespace
+function setStateAndDevicesAndLevel {
+	# This functions is called for the line that starts a new RAID device by setCurrentRaid, with the complete line in $1
+	# It parses the STATE, the LEVEL and the DEVICES
+	local line="$1"
+	local x1="${line#*: }" 				# Remove : prefix
+	STATE="${x1%% *}" 					# Only the first word
+	local x2="${x1:$((${#STATE}+1))}"	# Remove the first word
+	LEVEL="${x2%% *}" 					# Only the first word
+	local x3="${x2:$((${#LEVEL}+1))}"	# Remove the first word
+
+	LEVEL="${LEVEL:4}"					# Remove the raid prefix
+
+	for dev1 in $x3; do
+		local dev2="${dev1%[*}"
+		if [ -n "$DEVICES" ]; then DEVICES="$DEVICES "; fi
+		DEVICES="${DEVICES}$dev2"
+	done
+
+	log "STATE = $STATE"
+	log "LEVEL = $LEVEL"
+	log "DEVICES = $DEVICES"
+}
+
+SIZE_IN_BLOCKS="!"	# int
+NUM_DEVICES=0		# int with number of devices in raid
+BAD_DEVICES=0		# int with number of "_" in "[UUU_UU]"
+function parseConfigStatusLine {
+	# This function is called for 1st line after the raid definition line
+	# It parses the SIZE_IN_BLOCKS
+	local line="$1"
+	line="${line:6}"			# trim left
+	SIZE_IN_BLOCKS=${line%% *}
+
+	local lastWord=${line##* }	# Get the last word
+	lastWord=${lastWord:1:-1}	# Remove first and last char
+	NUM_DEVICES=${#lastWord}	# str length = num devices
+	lastWord=${lastWord//U/}	# Remove all U, so only _ remain
+	BAD_DEVICES=${#lastWord}	# str length = num bad devices
+
+
+	log "SIZE_IN_BLOCKS = $SIZE_IN_BLOCKS"
+	log "NUM_DEVICES = $NUM_DEVICES"
+	log "BAD_DEVICES = $BAD_DEVICES"
+	# TODO
+}
+
+function parseBitmapOrRecoveryLine {
+	# This function is called for the 2nd line after the raid definition line
+	# It checks whether it contains a bitmap or a recovery line
+	if [[ "$1" == *bitmap* ]]; then
+		parseBitmapLine "$1"
+	fi
+	if [[ "$1" == *recovery* ]]; then
+		parseRecoveryLine "$1"
+	fi
+}
+
+function parseBitmapLine {
+	local x
+	# TODO
+}
+
+RECOVERY_PROGRESS=	# float in percent
+RECOVERY_INFO=		# finish and speed
+function parseRecoveryLine {
+	# This function is called for the 2nd or 3rd lineafter the raid definition line
+	# It sets the RECOVERY_PROGRESS
+	local line="$1"
+	
+	local x1="${line##*recovery = }"
+	local x2="${x1%%%*}"
+	RECOVERY_PROGRESS="$x2"
+	
+	local x3="${line##*finish=}"
+	RECOVERY_INFO="finish=$x3"
+
+	log "RECOVERY_PROGESS = $RECOVERY_PROGRESS"
+	log "RECOVERY_INFO = $RECOVERY_INFO"
+}
+
+function printOutputAndExit {
+	# STATE, LEVEL, DEVICES, SIZE_IN_BLOCKS, NUM_DEVICES, BAD_DEVICES, RECOVERY_PROGRESS, RECOVERY_INFO
+
+	local result="OK"
+	local info=""
+
+	if [ -n "$RECOVERY_PROGRESS" ]; then
+		result="WARNING"
+		if [ -n "$info" ]; then info="$info. "; fi
+		info="${info}Recovering: $RECOVERY_PROGRESS $RECOVERY_INFO"
+	fi
+
+	if [ "$STATE" != "active" -a "$STATE" != "started" ]; then
+		result="CRITICAL"
+		if [ -n "$info" ]; then info="$info. "; fi
+		info="${info}State is $STATE"
+	fi
+
+	if [ $BAD_DEVICES -gt 0 ]; then
+		result="CRITICAL"
+		if [ -n "$info" ]; then info="$info. "; fi
+		info="${info}Missing $NUM_DEVICES devices"
+	fi
+
+	echo -n "$result"
+	if [ -n "$info" ]; then
+		echo -n ": $info"
+	fi
+
+	echo -n " |"
+	echo -n " 'raid level'=$LEVEL"
+	echo -n " 'size in blocks'=$SIZE_IN_BLOCKS"
+	echo -n " 'num devices'=$NUM_DEVICES"
+	echo -n " 'num bad devices'=$BAD_DEVICES;;1;0;$NUM_DEVICES"
+	if [ -n "$RECOVERY_PROGRESS" ]; then
+		echo -n " 'recovery progress'=$RECOVERY_PROGRESS%;0.1;;0;100"
+	fi
+	echo
+
+	case $result in
+		OK)       exit 0;;
+		WARNING)  exit 1;;
+		CRITICAL) exit 2;;
+	esac
+}
+
+
+HAD_TARGET_RAID=0
+
+while IFS= read -r line; do
+    #echo "  : $line"
+
+	setCurrentRaid "$line"
+
+	if [ "$CURRENT_RAID" == "$TARGET_RAID_NAME" ]; then
+		case $HAD_TARGET_RAID in
+			0) setStateAndDevicesAndLevel "$line";;
+			1) parseConfigStatusLine "$line";;
+			2) parseBitmapOrRecoveryLine "$line";;
+			3) parseRecoveryLine "$line";;
+		esac
+		HAD_TARGET_RAID=$(($HAD_TARGET_RAID+1))
+	elif [ $HAD_TARGET_RAID -gt 0 ]; then
+		printOutputAndExit
+	fi
+done < /proc/mdstat
+
+echo "CRITICAL: RAID $TARGET_RAID_NAME not found in mdstat"
+exit 2
+