Date: May 12, 2002
When you install AIX 5, you can choose either a 32 or 64 bit kernel. In most cases, the choice isn't critical. Here's the similarities and differences.
Both 32 and 64 bit kernel support 64 bit applications Both support JFS2 (large filesystems)
The 64 bit kernel supports over 96 GB memory.
My recommendation is to install the 32 bit kernel, unless
you're using JFS2 or need to support over 96 GB memory.
The 32 bit kernel has been around longer, and internal
benchmarks show comparable performance to the 64
bit kernel. On the other hand, I understand the 64
bit kernel runs JFS2 better.