Downgrade Technology Level or Service Pack on AIX

[aixquest]

Anybody knows a good way to downgrade TL or SP on AIX?

 

[DukeSSD]

mksysb restore seems to be the only way these days because some filesets seem to get committed even if you specify to only apply the update.

 

[MoreFeo]

If the TL or SP has been installed with COMMIT=NO you may be able to reject applied but not comitted ptfs, but it's still not sure it will downgrade all the packages.

If the SP or TL level comes from a complete installation I think there is no supported way to downgrade a complete SP or TL.

 

[exsnafu]

ibm doesn't support rejecting the TL level but I think you can APPLY an SP level and reject it without issue.

my recommendation is look into using alt_disk_install when applying TL upgrades so you have an easy backout if something goes wrong..

we usually break the rootvg mirror and keep the older version of aix handy for a week after the upgrade in case of complaints/issues.

 

[aixquest]

Thanks for the info.