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As a starting point for this type of analysis, I recommend you first provide an environment specification comparison view between the AIX 64-bit environments vs. Windows.
Please include the following detail for each separate runtime environment:
- Server specifications, including # of physical processors/cores, CPU clock speed etc.
- OS version; (including 32-bit vs. 64-bit)
- JDK vendor and version (including 32-bit vs. 64-bit)
- Weblogic version
One quick question, when switching to AIX 64-bit, did you also migrate from a 32-bit VM (on Windows) to 64-bit VM or was your Java VM also 64-bit on Windows os? If this this is the case then you may want to have a look at my article below, we did a recent capacity analysis comparaison between AIX 32-bit vs 64-bit to revisit any negative impact and assess the hardware requirements.