I can add to this, working on this same issue now. We had a customer move from a FAS3020 in 7-mode to a 8020 in c-mode. Monitoring was working previously for the global status but since the cutover nagios was reporting OID not found. I was able to pull the MIB from the device by going to t http(s)://cluster-mgmt-ip/spi and downloading it. I imported this into a MIB browser and located the misc global status OID which is 1.3.6.1.4.1.789.1.2.2.4.0 however a snmpget to the cluster (both nodes and the VIP) results in a response of:
Error in packet
Reason: (noSuchName) There is no such variable name in this MIB.
Failed object: .1.3.6.1.4.1.789.1.2.2.4.0
It's almost as if the filer has no idea that the OID exists. In fact I did a SNMPWALK on the device and output that to a file and don't find that OID at all. In fact there appears to be nothing under the .2 identifier yet it's listed in the MIB. (1.3.6.1.4.1.789.1.2.2)
What gives? How do you measure anything in the misc category per the MIB as they are all 1.3.6.1.4.1.789.1.2.2.x.x? This is Ontap 8.3 btw. Any help on this would be appreciated. Thanks!