-=XrAy=- brings up some interesting points - I am glad he knows of these two core security mechanisms. And the redbook is a good starting point - even considering that it was written in October 2002 (these mechanisms have been available from at least 1996).

I would like to suggest you take a look at a couple of my blogs on IBMSystemsMagazine, in particular SecuringAIX: Combining audit and syslog where I describe how this command

Code:

auditstream -m -c general | tee -a /audit/general.bin | auditselect -e "result==FAIL && command!=java" | auditpr -v | logger -p local1.warn -t audit &

integrates audit with syslog.

And/or perhaps -=XrAy=- can tell us where he got his example from, as audit does not write automatically to syslog. The output (with comment built-in) is quite nice!

For this kind of detection, today! I would use a PowerSC component known as RTC - Real-Time-Compliance. "Real-Soon" I will be doing a writeup on that in my blog SecuringAIX.
However, more in general, two partitions aka LPAR on a POWER server are isolated by the firmware. Connections and monitoring of network activity would be the same as for a standalone host.
Properly configured, "disks" local to one partition are not accessible from another partition. The exception to this could be the VIO server when using VSCSI as the VIOS hosts the disks. Normally, VIOS are considered part of the managed system and "regular", unauthorized users/administrators are not permitted access. Again, under proper configuration and management conditions "side-ways" access should not be possible. This also can be additionaly protected by using NPIV rather than VSCSI. Now the storage team can control which partitions can see the "disks" aka LUNS by controlling/managing which virtual HBA(s) may access the luns.
Note: in a POWERHA/SystemMirror configuration is is considered normal that two partitions may access the same "disk". There are tools in PowerHA/SystemMirror to monitor which system has "active" access.

In short, AIX, POWER and VIOS have been repeated certified. See IBM AIX: AIX operating system certifications for an overview.

I hope this helps.