<rrd_def>
     <path>${database}</path>
     <!-- not mandatory -->
     <start>1000123456</start>
     <!-- not mandatory -->
     <step>300</step>
     <!-- at least one datasource must be supplied -->
     <datasource>
         <name>input</name>
         <type>COUNTER</type>
         <heartbeat>300</heartbeat>
         <min>0</min>
         <max>U</max>
     </datasource>
     <datasource>
         <name>temperature</name>
         <type>GAUGE</type>
         <heartbeat>400</heartbeat>
         <min>U</min>
         <max>1000</max>
     </datasource>
     <!-- at least one archive must be supplied -->
     <archive>
         <cf>AVERAGE</cf>
         <xff>0.5</xff>
         <steps>1</steps>
         <rows>600</rows>
     </archive>
     <archive>
         <cf>MAX</cf>
         <xff>0.6</xff>
         <steps>6</steps>
         <rows>7000</rows>
     </archive>
 </rrd_def>