lsmksysb

There's a simple command to list information about a mksysb image, called lsmksysb:

# lsmksysb -lf mksysb.image
VOLUME GROUP:      rootvg
BACKUP DATE/TIME:  Mon Jun 6 04:00:06 MST 2011
UNAME INFO:        AIX testaix1 1 6 0008CB1A4C00
BACKUP OSLEVEL:    6.1.6.0
MAINTENANCE LEVEL: 6100-06
BACKUP SIZE (MB):  49920
SHRINK SIZE (MB):  17377
VG DATA ONLY:      no

rootvg:
LV NAME    TYPE     LPs  PPs  PVs  LV STATE      MOUNT POINT
hd5        boot     1    2    2    closed/syncd  N/A
hd6        paging   32   64   2    open/syncd    N/A
hd8        jfs2log  1    2    2    open/syncd    N/A
hd4        jfs2     8    16   2    open/syncd    /
hd2        jfs2     40   80   2    open/syncd    /usr
hd9var     jfs2     40   80   2    open/syncd    /var
hd3        jfs2     40   80   2    open/syncd    /tmp
hd1        jfs2     8    16   2    open/syncd    /home
hd10opt    jfs2     8    16   2    open/syncd    /opt
dumplv1    sysdump  16   16   1    open/syncd    N/A
dumplv2    sysdump  16   16   1    open/syncd    N/A
hd11admin  jfs2     1    2    2    open/syncd    /admin