Starting in AIX 5.3 ML5, there is a new "topas -R" option that records theperformance of all partitions on a physical server. The command is runon just one server, and the output is stored in the /etc/perf directory. The "topasout" command converts the output file into a CSV or XML file. The CSV file can be imported into the nmon Analyser 3.2.3+. (Requires AIX 5.3 TL5 service pack 4 with APAR IY87993)
The advantage is that topas is a supported tool. The disadvantage isthat it is not well documented, and you have to do some of the parsing. Be prepared to do some "trailblazing".
For more information, see the man pages for "topas". Other sources of information include:
Write up by Doug Ranzhttp://rainsux.dyndns.org/topas-recording-reporting.pdf
VIOS Monitoring Wiki (There's a section on "topas -R")http://www-941.ibm.com/collaboration/wiki/display/WikiPtype/VIOS_Monitoring