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NNMi monitoring of APs

Hi there.  We are monitoring various Cisco Aps through NNMi.  All was fine till a few days ago, when a threshold was set, and all the APs of a certain model started showing alarms and not clearing.

The model in question is mainly a 1262, and NNMI has started monitoring these OIDs

hajap177-0204:
Policy: Cisco Memory Pool Performance Monitoring
Target: 10.230.4.84
Poller: NnmSnmpPoller, Target Responding: true, Poll Successful: true, Poll Duration: 15 mSec
sysUpTime 520969360
Object    | memoryUtil | freeMemory | ciscoMemoryPoolUsed | ciscoMemoryPoolFree
----------|------------|------------|---------------------|--------------------
I/O.8     | 0.51       | 16300.51   | 85496               | 16691720           
Processor | 39.87      | 40440.8    | 27457288            | 41411380           
I/O.2     | 85.94      | 4608.1     | 28835736            | 4718696     
       
hajap217-0601:
Policy: Cisco Memory Pool Performance Monitoring
Target: 10.230.4.124
Poller: NnmSnmpPoller, Target Responding: true, Poll Successful: true, Poll Duration: 34 mSec
sysUpTime 1470244695
Object    | memoryUtil | freeMemory | ciscoMemoryPoolUsed | ciscoMemoryPoolFree
----------|------------|------------|---------------------|--------------------
Processor | 39.81      | 40483.46   | 27413604            | 41455064           
I/O.2     | 85.94      | 4608.1     | 28835736            | 4718696            
I/O.8     | 0.51       | 16300.51   | 85496               | 16691720     

Namely it's the I/O.2 that is causing the problem, as the threshold is set at 85%, and its sitting at 85.9.  I've looked at several APs, and the all show the same memory usage, and it doesn't change hour on hour,

ap graph.JPG

which leads me to believe that that's how it's meant to behave, there's nothing to worry about, and we should just set our threshold to 90%.  The problem lies in the fact that we are a big cumbersome company, and the NOC won't change the threshold without documentary evedence that the threshold should be changed (they can't tell me on what information they based the decision to chose 85% for this particular OID.....). 

Can anyone tell me what the difference between the I/O.2 and the I/O.8 is?  and it there a Cisco recommended baseline to monitor against?

Cheers, Al.

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