Hi Frazer,
Got few questions on the storage environment that you plan to monitor & manage:
1. What is the version of the ONTAP running? Also is it running 7-mode or C-Mode?
2. How many storage systems/clusters you plan to manage?
3. Do you wish to monitor performance stats as well?
4. What data protection requirements do you have?
5. How is your datacenter topology? Is it spread across geos?
6. Do you use any of the virtualization products in your DC?
To get the system requirement to run OnCommand UM please refer to documentation at:
https://library.netapp.com/ecmdocs/ECMP1113536/html/html/frameset.html
Regards,
-Amir