AIX Switching Kernel Bit Modes

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Switching to the 32 bit Kernel

  1. Linking the 32 bit kernel.
    # ln -sf /usr/lib/boot/unix_mp /unix
    # ln -sf /usr/lib/boot/unix_mp /usr/lib/boot/unix
  2. You will need to note which hdisks that hd5 appears on.
    # lslv -m hd5
  3. Change the base operating system boot devices repeat for each disk listed in previous step.
    # bosboot -ad <hdisk#>
  4. Add the drives to the bootlist that where listed with the lslv command.
    # bootlist -m normal <hdisk#> ... <hdisk#n>
  5. Restart the server to apply the changes.
  6. Verify that the server is running the 32 bit kernel.
    # bootinfo -K

Switching to the 64 bit Kernel

  1. Ensure that the hardware is 64 bit enabled.
    # bootinfo -y
  2. If the previous command returns 64 bit then proceed.
  3. Linking the 64 bit kernel.
    # ln -sf /usr/lib/boot/unix_64 /unix
    # ln -sf /usr/lib/boot/unix_64 /usr/lib/boot/unix
  4. You will need to note which hdisks that hd5 appears on.
    # lslv -m hd5
  5. Change the base operating system boot devices repeat for each disk listed in previous step.
    # bosboot -ad <hdisk#>
  6. Add the drives to the bootlist that where listed with the lslv command.
    # bootlist -m normal <hdisk#> ... <hdisk#n>
  7. Restart the server to apply the changes.
  8. Verify that the server is running the 64 bit kernel.
    # bootinfo -K

Resources

  1. IBM pSeries and AIX Information Center
  2. AIX Commands you should not leave home without