change 32bit kernel to 64 bit !!

[bandez]

Hi,

How can I change my 32bit kernel to 64bit.
AIX is 64 bit but run as 32 bit.
I wanted to create a link from /usr/lib/boot/unix_64 but I did not find it
What can I do?

Thanx

 

[PSD]

bandez,

smitty load64bit

This will take you to the following menu :

Enable Now
Enable/Disable at System Restart

Select enable now and then select enable 64 bit env. at system restart. A line is added to inittab to load this automatically at system reboot.

Cheers

Paul PSD
IBM Certified Specialist - AIX V4.3 Systems Support
IBM Certified Specialist - AIX V4 HACMP

 

[aixat]

WRONG ANSWER.

ONLY AT AIX 5.1 there is option to use either 32 bit or 64 bit kernel.

The 64 bit application environment is for any application (for example Oracle) that could use of 64 bit hardware.

This question has been asked before on this forum do the search on it and you will find more info.

techsupport.services.ibm.com then do search on the same issue.

 

[AIX5L]

If you are running AIX 5.1

Switching From 32 to 64 Bit Mode

To switch from 32-bit mode to 64-bit mode run the following commands, in the given order:

1.ln -sf /usr/lib/boot/unix_64 /unix
2.ln -sf /usr/lib/boot/unix_64 /usr/lib/boot/unix
3.bosboot -ad /dev/ipldevice
4.shutdown -Fr
5.bootinfo -K (should now show 64)

Switching From 64 To 32-Bit Mode

To switch from 64-bit mode to 32-bit mode run the following commands, in the given order:

1.ln -sf /usr/lib/boot/unix_mp /unix
2.ln -sf /usr/lib/boot/unix_mp /usr/lib/boot/unix
3.bosboot -ad /dev/ipldevice
4.shutdown -Fr
5.bootinfo -K (should now show 32)

 

[bandez]

Thakx the answers !!
Very useful

To aixat:
I searched the forum before I asked this question.I couldnt get enough infos previous answers.
By the way aixat, oracle cannot run on aix5.1 with 64 bit kernel.
Only 32 bit because of the pw-syscall !!
Otherwise you are right, only aix 5.1 can switch the kernel to 64 bit.

 

[Yegolev]

I have (at least one) S80 running 4.3.3.0-09 with 64-bit enabled:

load64bit:2:wait:/etc/methods/cfg64 >/dev/console 2>&1 # Enable 64-bit execs

You will need 64-bit hardware, such as the H70. The above line is the only config change. IBM indicated to us that enabling 64-bit has no impact on 32-bit applications.

As for oracle, we are testing that soon. IBM Certified -- AIX 4.3 Obfuscation

 

[Yegolev]

As a bit of follow-up, today we are updating a development S80 to 4.3.3.0-10 with IY30151 with the intent of running Oracle9i-64-bit. If anyone is interested I'll see if I can post back about success/failure/learnings. IBM Certified -- AIX 4.3 Obfuscation

 

[aixat]

http://WWWWWWWWHHHHHHHHHHYYYYYYYYYY?.

You do not read do you.?
At AIX 4.3.3 the kernel is 32 bit only. It does not matter oracle is 64 bit.

The kernel is not.
Only at AIX 5.1 kernel is 32 bit or 64 bit.

 

[maikvvc]

Hi!

Can anybody explain where are the advantages when the kernel is run in 64Bit-mode?

Does the kernel work faster, more stable?

 

[bandez]

Hi maikvvc,

You can feel the advantages of a 64 bit kernel in memory adressing, maximum file size, maximum partition size, in the LVM if you use it and of course it faster.

 

[aixat]

http://www.redbooks.ibm.com

then search word 64 and aix.