Can O/S be changed from 32-bit to 64-bit?

[billo102]

Hi

Just wondering if aix 5.3 o/s can be upgraded from 32-bit to 64-bit? Or does it need a complete re-install of the O/S? Or can it not be done at all as it's dependant on the hardware somehow?

many thanks

 

[billo102]

I think this can be ignored, I found this info :

How to Change Your 32-bit AIX Kernel to 64-bit
1) Create/overwrite your links to the Unix kernel:
ln -sf /usr/lib/boot/unix_64 /unix
ln -sf /usr/lib/boot/unix_64 /usr/lib/boot/unix

2) Verify:
ls -l /unix
ls -l /usr/lib/boot/unix
lsvg -l rootvg

3) Create your boot image and restart:
lslv -m hd5
bosboot -ad /dev/ipldevice
shutdown -Fr

Note: If you have LSOF installed, make sure you’re running the 64-bit version. Check out the last part of my How to Install LSOF post.

4) After you reboot, verify your OS Kernel:

bootinfo -K

How to Revert Back from 64-bit to 32-bit:
From 64-bit to 32-bit:
ln -sf /usr/lib/boot/unix_mp /unix
ln -sf /usr/lib/boot/unix_mp /usr/lib/boot/unix
lslv -m hd5
bosboot -ad /dev/ipldevice
shutdown -Fr

 

[sjm2]

billo102 is correct as long as your hardware can run the 64-bit kernel. Use "bootinfo -y" to test. See this:

http://www.ibm.com/developerworks/aix/library/au-dutta_cmds.html

 

[billo102]

bootinfo -y returns 32 bit

So is this telling me that the processor is only 32 bit? therefore we can't change to 64-bit ?

many thanks

 

[DukeSSD]

Yes, your machine is 32 bit:

http://publib.boulder.ibm.com/infoc...x.baseadmn/doc/baseadmndita/hardware64bit.htm