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AIX TL/SP Roll Back

I have applied AIX TL/SP upgrade. I have upgraded my system from AIX 6.1TL8SP2 to AIX 6.1TL8SP3. How to I roll back the changes to AIX 6.1TL8SP2. Do I need to reboot my server to do this..???

I have applied all my changes but not committed.
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aanya247
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aanya247
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woolmilkporcCommented:
First of all, why would you want to roll back the update?

It is almost always possible to repair the defects possibly caused by an update instead of reverting to the older level!

So which problems do you experience?

If you really want to roll back - you're lucky that (1) it's only an SP and not a TL (a TL cannot be removed) and that (2) you only applied the changes instead of also committing them.

But please be aware - you're always at risk of corrupting the whole system!
Didn't you create a bootable mksysb image before updating? If you did it might be much better to restore this image!

If you still want to reject the updates - run "smitty reject" and select everything which is displayed after you hit <F4> next to "SOFTWARE name". Choose not to remove dependent software, but be prepared that the uninstall can fail this way! On the other hand, rejecting dependents can uninstall more than expected, you might have to reinstall some packages!

In any case, run a "PREVIEW" first (really!) and take a bootable mksysb on tape/DVD/NIM (really! really!) before proceeding with the actual uninstall!

I assume you noted the many exclamation points? This should be an indication for you that I'm really afraid that the process might well fail and leave you with a corrupted system! If you want to do it anyway - it's your own risk!

Finally - of course you'll have to reboot. You rebooted after applying the SP, didn't you?

Check carefully smitty's log of the reject process. Do you see an indication that a bosboot command has been run? If you don't run

bosboot -a -d /dev/ipldevice

Failure to do this will cause the reboot to fail and your machine will bite the dust. But still no guarantee that your system will not fail due to other than bootrecord-related issues!

wmp
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aanya247Author Commented:
Thanks wmp, I have rebooted the system after the AIX "update" to AIX 6.1TL8SP3, I just was curious to know what happens if I want to Roll back, because lately I have updated a wrong system and luckily it was a test server and what is why I have asked this question.
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woolmilkporcCommented:
Phew!

And I thought ...

Anyway, please take my advice to create a bootable mksysb image on tape/DVD/NIM before applying an SP or even a TL very seriously!
Having such a thing at hand to restore the OS if needed can (will) save your butt!

With a sigh of relief

wmp
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