Verification of 64-bit AIX kernel

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You must verify that the 64-bit AIX® kernel is installed and running. Run the commands to verify that your AIX system has the 64-bit kernel.

To verify that you have the 64-bit kernel (/usr/lib/boot/unix_64) installed and running, run the following command: 
bootinfo -K

When you install the operating system, go to Additional features and specify 64-bit mode.