Using Smit  1) Go to Volume Groups and select "Set Characteristics of a Volume Group2) select "Add a Physical Volume to a Volume Group"3) select VOLUME GROUP name and then PHYSICAL VOLUME name (these should be your new hdiskpower devices4) At this point new hdiskpower devices are part of the volume group5) In Smit select "Mirror a Volume Group"6) Select volume group you are mirroring and hdiskpower devices you added earlier7) When mirroring is done you will need to "un-mirror" old disks8) In smit select "Unmirror a VOlume Group"9) select volume and then pick old disks10)next step is to remove old disks from the volume group11) In Smit select "Set Characteristics of a Volume Group12) In smit select "Remove a Physical Volume from a Volume Group"13) select volume group and old disks14) run lspv and old disks should have "None" in the column.15) final step is to remove devices from AIX perspective (rmdev -dl hdisk2)  by the way, you might want to still consider using striped metas as they may provide better performance in certain workloads. There have been a couple of threads discussing that.
we are migrating from IBM array to EMC VMAX array. The host OS is AIX  and planning to use AIX LVM. We want to do migrations based on volume groups i.e if a volume group has 3 devices 20gb 30gb 40gb then we will assign a 90gb vmax lun and move the volume group to the new VMAX lun. I want to know the AIX LVM commands involved in this process of migrating vg's.
aix lvm volume group migrations