I have put together a package of the work that I have done for Network Appliance systems. Network Appliance makes a number of products. This is for Network Appliance storage array filers, but it's a good place to start and put together definitive and uniform Network Appliance support for Cacti.
Graphs produced includes;
CPU Usage (Single CPU, not indexed)
CPU Interrupts (Single CPU, not indexed)
Storage Volume Usage for filers (indexed)
You will need to copy the netapp_volumes.xml file to "cacti/resource/snmp_queries/netapp_volumes.xml".
Import the cacti_host_template_network_appliance_host.xml. It includes necessary dependencies. This template was exported with Cacti v0.8.6b.
I have also included applicable MIBs.
If you wish to improve this for other Network Appliance devices, that would be great. Update it, test it, and post it. For work which is applicable, this work is public domain. Note that the MIBs are from Network Appliance.
Other Netapp links include...