Quick step-by-step for when I am forgetting things:
hostname:root> cfgmgr
Discover disks
hostname:root> lspv
Note whether SAN is HDLM (Hitachi) or VPATH (Shark)
Note hdisk# or vpath#
Should also report disks, in VGs and otherwise
hostname:root> lsvg -l VGname
Note which VG a filesystem is in
hostname:root> smitty lvm
>> Volume Groups
>> Add a Data Path Volume to a Volume Group (Shark)
>> Force the creation of a volume group? no (Leave Default)
>> * VOLUME GROUP name (F4 to list volume groups)
>> * PHYSICAL VOLUME names (F4 to list available volumes)