Before the kernel change, pls verify the existing kernel first :

　　#bootinfo -K

　　64 -----> 64-bit kernel

　　32 -----> 32-bit kernel

　　The following example provides the commands to change the 64-bit kernel to 32-bit kernel :

　　# ln -sf /usr/lib/boot/Unix_mp /unix

　　# ln -sf /usr/lib/boot/unix_mp /usr/lib/boot/unix

　　# bosboot -ad /dev/ipldevice

　　# shutdown -Fr

　　After the system has rebooted, it will be running the 32-bit kernel.

　　Don't change the kernel to 32-bit , if your rootvg is running jfs2 .

　　jfs2 must be running under 64-bit kernel enable