How to check if AIX will run 64 bit software
To determine if the AIX version 4.3 or higher operating system is running in 64 bit or 32 bit mode run the following command
genkex | grep syscalls64.ext
If syscalls64.ext is displayed in the output then the server is running the 64 bit application environment and can run 64 bit software.
The 64 bit application environment can be used regardless of whether the kernel is 64 or 32 bit as long as the hardware is 64 bit.
To determine if the hardware is 32 or 64 bit run the following command
bootinfo -y
A 64 bit kernel is only available in AIX 5 or higher. On AIX 5 the following command can be run to determine if the kernel is 64 bit
bootinfo -K