Hi Govinda,
Your procedure looks good. It should work ok.
If you are using SF 5.0,then you may get udid mismatch in vxdisk list output,
which is ok, as the new LUN's serial number would be different than original ones.
Refer to SF 5.0 VxVM user guide for UDID details. Also before running vxdisk updateudid,
to fix the udid mismatch error, check if you have latest patches installed.
Also if you are using our SFRAC product, you may have to reboot all the nodes
in the cluster after fencing disks are migrated. There are few technotes available
in our support site http://support.veritas.com on this topic as well.
Good Luck.
Regards
Srini