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README.md

@@ -5,6 +5,13 @@ It has more graphs and triggers. It uses the OID as zabbix was having issues par
 Note: You might get erros if you don't fix the MIB. See bug here:
 https://forums.freenas.org/index.php?threads/freenas-11-1-snmp-index-out-of-range.62732/
 
+Please Note: For ZVols, ZPools and Datasets the data is multiplied by 4096 under PreProcessing. This is the AllocationUnits. All of mine were 4096 so decided this is neater. Obviously this can be changed if required, you can get his data from an SNMP Walk. This could be done automatically by creating a item prototype of allocationUnits, another to get the data in units and then another item prototype to to calculate the value in bytes. This would instead of 14 item prototypes; there would be 42. If anyone knows of a better way then please let me know.
+
+Eg: snmpwalk -v 2c -c public 192.168.1.50 FREENAS-MIB::zvolAllocationUnits
+snmpwalk -v 2c -c public 192.168.1.50 FREENAS-MIB::zpoolAllocationUnits
+snmpwalk -v 2c -c public 192.168.1.50 FREENAS-MIB::datasetAllocationUnits
+
+
 
 1) Import the following templates if they are not already
 https://share.zabbix.com/official-templates/snmp-devices/snmp-interfaces-discovery