diff --git a/xymon/plugins/client/ext/smart b/xymon/plugins/client/ext/smart
new file mode 100755
index 0000000..88c5f7c
--- /dev/null
+++ b/xymon/plugins/client/ext/smart
@@ -0,0 +1,59 @@
+#!/bin/sh
+
+# NOTE: Must be run as root, so you probably need to setup sudo for this.
+
+# Thanks to xymon.com − https://www.xymon.com/xymon-cgi/viewconf.sh?smart
+
+if test -f /tmp/dres; then rm -f /tmp/dres; fi
+
+
+# MODIFY below to match your setup - the "scsi-SATA" is pretty generic, but you
+# can add more disks if you like. E.g. I have a USB disk permanently plugged in.
+
+ls /dev/disk/by-id/scsi-SATA_* /dev/disk/by-id/usb-WD* | grep -v -- -part | sort |
+while read DISK
+do
+	DRES=`/usr/sbin/smartctl -H -n standby $DISK`
+	DCODE=$?
+	DSTBY=$(( $DCODE & 2 ))
+	DFAIL=$(( $DCODE & 8 ))
+	DWARN=$(( $DCODE & 32 ))
+
+	if test $DSTBY -ne 0
+	then
+		COLOR="4&clear"
+	elif test $DFAIL -ne 0
+	then
+		COLOR="1&red"
+	elif test $DWARN -ne 0
+	then
+		COLOR="2&yellow"
+	else
+		COLOR="3&green"
+	fi
+
+	echo "${COLOR} $DISK"
+
+	echo "${COLOR} $DISK" | cut -c2- >>/tmp/dres
+	echo "" >>/tmp/dres
+	echo "$DRES" | egrep -v "^smartctl|^Copyright|^$|^===" >>/tmp/dres
+	echo "------------------------------------------------------------" >>/tmp/dres
+	echo "" >>/tmp/dres
+	echo "" >>/tmp/dres
+done >/tmp/dcheck
+
+COLOR=`cat /tmp/dcheck | awk '{print $1}' | sort | uniq | head -1 | cut -c3-`
+
+$XYMON $XYMSRV "status ${MACHINE}.smart ${COLOR} SMART health check
+
+`cat /tmp/dcheck | cut -c2-`
+
+==================== Detailed status ====================
+
+`cat /tmp/dres`
+"
+
+rm -f /tmp/dres /tmp/dcheck
+
+exit 0
+