Do you have the latest System p Agent fixes?
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A number of important fixes are now available for the IBM Tivoli Monitoring for System p agents v18.104.22.168:
AIX Premium Agent: Interim Fix 6.2.
CEC Base Agent Interim Fix 6.2.
HMC Base Agent Interim Fix 6.2.
If you install the System p Reports Interim Fix 6.2.
In addition, make sure have the latest AIX perfagent.tools fileset installed on all your LPARs. Details are here:
Required perfagent.tools versions
For the latest information on the System p agents, check out the troubleshooting wiki: