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 )
