AIX System Performance Support requires the person opening the case have some insight into the issue being reported.  Gathering information before calling IBM support could shorten the time it takes to resolve your issue.   The AIX System Performance Analysis team requires at least two pieces of information when diagnosing a AIX System Performance issue:

1. Problem description
2. Perfpmr data collection
.
In the second of these two videos, Alan Hunt talks through the recommended IBM Technical Must Gather doc and the importance of this document - and the data IBM asks you to collect.  The perfpmr.sh script, it's importance - and a demonstrationn of how this can run on an AIX server.

For additional support and documentation on this topic please refer to the following link:
https://www.ibm.com/support/pages/aix-mustgather-system-performance-analysis