commit ba70f3b737fcd175b2d646316f55e9c6a838fcf5
Author: Jonny007-MKD <me@jonny007-mkd.de>
Date:   Thu Feb 6 20:50:46 2020 +0000

    Fork from https://exchange.icinga.com/jasem/check_md_raid updated

diff --git a/check_mdstat.sh b/check_mdstat.sh
new file mode 100755
index 0000000..52488df
--- /dev/null
+++ b/check_mdstat.sh
@@ -0,0 +1,47 @@
+#!/bin/bash
+#
+# Created by Sebastian Grewe, Jammicron Technology
+# Changes By Jasem Elayeb on 02.03.2016
+# JE: add Physical Disks Name RAID_DISKS
+# JE: add Physical Disks Status DISKS_STATUS
+# JE: add Array Names RAID_ARRAY
+
+# Get count of raid arrays
+RAID_DEVICES=`grep ^md -c /proc/mdstat`
+
+# Get count of degraded arrays
+RAID_STATUS=`grep "\[.*_.*\]" /proc/mdstat -c`
+
+# 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, $RAID_STATUS have FAILED"
+        EXIT=2
+fi
+
+# Status and quit
+echo -e "$STATUS \n Physical Disks: $RAID_DISKS Disks Status: $DISKS_STATUS "
+exit $EXIT