Alternate disk Installation method

1)Create a copy of rootvg to a free disk and simultaneously clone and migrate it to a new version or release level of AIX.

#unmirrorvg hdisk1

#migratepv hdisk1 hdisk0

#reducevg rootvg hdisk1


#alt_disk_install -C  -d /dev/cd0 hdisk1


2)Reboot the server (Boot list will be automatically changed to hdisk1  )

You will found two rootvg disks after rebooting

altint_rootvg

old_rootvg


3)If you found no problem with newer version then

alt_disk_install -X ( This will delete the  old rootvg)

else

Change the bootlist to old disk hdisk0 and reboot the server.

Then execute

alt_disk_install -X ( This will delete  new rootvg  )