#!/bin/sh
# Usage: check_disk_snmp hostname community volume warning critical
# This plugin requires the bc program and snmp utilities
# Example: check_disk_snmp main public 2 80% 95%
STATE_OK=0
STATE_WARNING=1
STATE_CRITICAL=2
STATE_UNKNOWN=3
STATE_DEPENDENT=4

#MESSAGE=`telnet $1 $PORT 2> /dev/null | grep -e ^$2`
# You can use awk or cut
#DISK_USED=`snmpget -v 1 $1 -c $2 hrStorageUsed.$3 | awk '{print $4}'`
#DISK_SIZE=`snmpget -v 1 $1 -c $2 hrStorageSize.$3 | awk '{print $4}'`
DISK_USED=`snmpget -v 1 $1 -c $2 hrStorageUsed.$3 | cut -d \  -f4`
DISK_SIZE=`snmpget -v 1 $1 -c $2 hrStorageSize.$3 | cut -d \  -f4`
DISK_DESC=`snmpget -v 1 $1 -c $2 hrStorageDescr.$3 | cut -d \  -f4`
USE_PERCENTAGE=$(echo "100 * $DISK_USED / $DISK_SIZE" | bc)

WARNING=`echo $4 | cut -d% -f1`
CRITICAL=`echo $5 | cut -d% -f1`

STATE=$STATE_UNKNOWN
STATUS="DISK  UNKNOWN"

if [ $USE_PERCENTAGE -lt $WARNING ]; then
        STATE=$STATE_OK
        STATUS="DISK OK"
fi

if [ $USE_PERCENTAGE -eq $WARNING ]; then
        STATE=$STATE_OK
        STATUS="DISK OK"
fi


if [ $USE_PERCENTAGE -gt $WARNING ]; then
        STATE=$STATE_WARNING
        STATUS="DISK WARNING"
fi

if [ $USE_PERCENTAGE -gt $CRITICAL ]; then
        STATE=$STATE_CRITICAL
        STATUS="DISK CRITICAL"
fi

echo $STATUS - $USE_PERCENTAGE% of $DISK_DESC on $1 used
exit $STATE


or

#!/bin/sh
# Usage: check_disk_snmp hostname community volume warning critical
# This plugin requires the bc program and snmp utilities
# Example: check_disk_snmp main public 2 80% 95%
STATE_OK=0
STATE_WARNING=1
STATE_CRITICAL=2
STATE_UNKNOWN=3
STATE_DEPENDENT=4

#MESSAGE=`telnet $1 $PORT 2> /dev/null | grep -e ^$2`
# You can use awk or cut
#DISK_USED=`snmpget -v 1 $1 -c $2 hrStorageUsed.$3 | awk '{print $4}'`
#DISK_SIZE=`snmpget -v 1 $1 -c $2 hrStorageSize.$3 | awk '{print $4}'`
DISK_USED=`snmpget -v 1 $1 -c $2 hrStorageUsed.$3 | cut -d \  -f4`
DISK_SIZE=`snmpget -v 1 $1 -c $2 hrStorageSize.$3 | cut -d \  -f4`
DISK_DESC=`snmpget -v 1 $1 -c $2 hrStorageDescr.$3 | cut -d \  -f4`
USE_PERCENTAGE=$(echo "100 * $DISK_USED / $DISK_SIZE" | bc)

WARNING=`echo $4 | cut -d% -f1`
CRITICAL=`echo $5 | cut -d% -f1`

STATE=$STATE_OK
STATUS="$USE_PERCENTAGE%  OK"

if [ $USE_PERCENTAGE -gt $WARNING ]; then
        STATE=$STATE_WARNING
        STATUS="$USE_PERCENTAGE% WARNING"
fi

if [ $USE_PERCENTAGE -gt $CRITICAL ]; then
        STATE=$STATE_CRITICAL
        STATUS="$USE_PERCENTAGE% CRITICAL"
fi

echo $STATUS - $USE_PERCENTAGE% of $DISK_DESC on $1 used
exit $STATE

# 'check_disk_snmp' command definition
define command{
        command_name    check_disk_snmp
        command_line    $USER1$/check_disk_snmp $HOSTADDRESS$ $ARG1$ $ARG2$ $ARG3$ $ARG4$
        }


define service{
        use                             generic-service         ; Name of service template to use
        host_name                       main
        service_description             C DRIVE
        is_volatile                     0
        check_period                    24x7
        max_check_attempts              3
        normal_check_interval           5
        retry_check_interval            1
        contact_groups                  nt-admins
        notification_interval           120
        notification_period             24x7
        notification_options            c,r
        check_command                   check_disk_snmp!public!2!80%!90%
        }