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Existing 32-bit kernel extensions continue to be supported by the 32-bit kernel, but these kernel extensions are not usable by the 64-bit kernel. Not all of the kernel extensions supported for the 32-bit kernel are supported for the 64-bit kernel, particularly the device drivers for the I/O.
Dual-mode Kernel Extensions: AIX 5L Version 5.1 supports dual-mode kernel extensions, which can be loaded by a common configuration method, regardless of which kernel is being used. A dual-mode kernel extension is an archive file that contains both the 64-bit and 32-bit versions of the kernel extension as members.
Installation and Enablement
The 64-bit kernel is provided as part of the base AIX 5L Version 5.1 base media and is installed on all hardware systems that it supports. By default, the 32-bit kernel is enabled at base system installation. However, you can override this at installation time to enable the 64-bit kernel through the system installation panels. (See "New Base Operating System Installation Menus" for details on enabling the 64-bit kernel at BOS installation time.)
It is possible to switch between the 32-bit and 64-bit kernels without reinstalling the operating system. This can be done by modifying the /usr/lib/boot/unix and /unix to be a symbolic link to the binary for the desired kernel, running the bosboot command to write a new system boot image, and rebooting. The path name of the 64-bit kernel is /usr/lib/boot/unix_64 while the path names of the uniprocessor and multiprocessor versions of the 32-bit kernel are /usr/lib/boot/unix_up and /usr/lib/boot/unix_mp.
JFS2
JFS2 (Enhanced Journaled File System) is a new file system providing the capability to store much larger files than the existing Journaled File System (JFS). Additionally, it is the default file system for the 64-bit kernel. Customers can choose to implement either JFS, which is the recommended file system for 32-bit environments, or JFS2, which offers 64-bit functionality.
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