These are some examples from Spruce one day.

Physical     Volume     Logical     Mount	
Volumes	     Group      Volume      Point (type)
--------     ------     -------     -----
hdisk0	     rootvg         hd1     /home
                            hd2     /usr
                            hd3     /tmp
                            hd4     /
                            hd5     /blv (boot)
                            hd6          (paging)
                            hd7     /mnt (dump)
                            hd8          (jfslog)
                         hd9var     /var
hdisk1       vicea         lv02     /vicepa
                        loglv00
hdisk2       --none--
hdisk4       datavg        lv05     /inst.images
hdisk5                  loglv03
--------------------------------------------------------------------------------
Physical Volumes = Actual disk drives.
Volume Group = Collection of physical volumes.
Logical Volume = How a volume group is split up.
Mount Point = How & where a logical volume is used.
--------------------------------------------------------------------------------
Commands to view all this.

lscfg -l hd*  To see all the physical volumes, their SCSI address and capacity.
lspv pv_name For each physical volume to see which volume group a physical
             volume is assigned to (if any).
lsvg -p vg_name to go the other way, that is, to see which physical volumes are 
                assigned to a particular volume group.  As in the case of datavg,
                this will tell you hdisk4 & hdisk5 are assigned.
lsvg -l vg_name to see which logical volumes are carved out of a particular
                volume group, and their mount points.
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New with AIX 4.1 are "fragments" and "fragment sizes".  For example, on the news
server, fox, Roy has the /var/spool/news file system set up for 1K fragment size
and 2048 bytes per inode.  Normally filesystems have 4K fragment sizes (i.e. don't
fragment a block) and 4K bytes per inode.  Essentially, Roy expects a bunch of 
tiny files in /var/spool/news.
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To see if a file system is Large File Enabled, as root(!!!) use lsfs -q,
e.g. on rhino,
  lsfs -q  /home/inst1/db_mount_ssa/db1fs
  Name            Nodename   Mount Pt                       VFS   Size      Options    Auto Accounting
  /dev/db1lv      --         /home/inst1/db_mount_ssa/db1fs jfs   209715200 rw         yes  no 
  (lv size: 209715200, fs size: 209715200, frag size: 4096, nbpi: 32768, compress: no, bf: true, ag: 64)
                                                                                       ========
                         Look at this part here.  bf=Big File (Enabled) ------------------/