create  LVOL0
LVOL0 --INT0--+--- Base0
              |
          |
          +--- NULL
    
create SNAP1    
LVOL0 --INT1--+--- Base1
              |
          |    
          +--- INT0(SNAP1)--+--- Base0
                                |
                            |
                            +--- NULL

create SNAP2
LVOL0 --INT2--+--- Base2
              |
          |    
          +--- INT1(SNAP2)--+--- Base1
                                |
                            |
                            +--- INT0(SNAP1)--+--- Base0
                                                  |
                                              |
                                              +--- NULL

create SNAP3
LVOL0 --INT3--+--- Base3
              |
          |    
          +--- INT2(SNAP3)--+--- Base2
                                |
                            |
                            +--- INT1(SNAP2)--+--- Base1
                                                  |
                                              |
                                              +---INT0(SNAP1)--+--- Base0
                                                                   |
                                                               |
                                                               +--- NULL

create SNAP4
LVOL0 --INT4--+--- Base4
              |
          |
          +--- INT3(SNAP4)--+--- Base3
                                |
                            |    
                            +--- INT2(SNAP3)--+--- Base2
                                                  |
                                              |
                                              +--- INT1(SNAP2)--+--- Base1
                                                                    |
                                                                |
                                                                +---INT0(SNAP1)--+--- Base0
                                                                                     |
                                                                                 |
                                                                                 +--- NULL
                                             
                                             
                                             
-----------------------------------------------------------------------------------------------------
delete SNAP4
LVOL0 --INT4--+--- Base4
              |
          |
          +--- INT3(SNAP4)--+--- Base3
                                |
                            |    
                            +--- INT2(SNAP3)--+--- Base2
                                                  |
                                              |
                                              +--- INT1(SNAP2)--+--- Base1
                                                                    |
                                                                |
                                                                +---INT0(SNAP1)--+--- Base0
                                                                                     |
                                                                                 |
                                                                                 +--- NULL
delete SNAP4 (delete INT4, delete Base4)                                             
update I/O channels LVOL0
delete alias SNAP4
LVOL0 --INT3--+--- Base3
              |
          |    
          +--- INT2(SNAP3)--+--- Base2
                                |
                            |
                            +--- INT1(SNAP2)--+--- Base1
                                                  |
                                              |
                                              +---INT0(SNAP1)--+--- Base0
                                                                   |
                                                               |
                                                               +--- NULL




-----------------------------------------------------------------------------------------------------
delete SNAP1
LVOL0 --INT4--+--- Base4
              |
          |
          +--- INT3(SNAP4)--+--- Base3
                                |
                            |    
                            +--- INT2(SNAP3)--+--- Base2
                                                  |
                                              |
                                              +--- INT1(SNAP2)--+--- Base1
                                                                    |
                                                                |
                                                                +---INT0(SNAP1)--+--- Base0
                                                                                     |
                                                                                 |
                                                                                 +--- NULL
delete SNAP1 (delete INT0, delete Base0)                                             
delete alias SNAP1
LVOL0 --INT4--+--- Base4
              |
          |
          +--- INT3(SNAP4)--+--- Base3
                                |
                            |    
                            +--- INT2(SNAP3)--+--- Base2
                                                  |
                                              |
                                              +--- INT1(SNAP2)--+--- Base1
                                                                    x
                                                                x
                                                                +---INT0(SNAP1)--+--- Base0
                                                                                     |
                                                                                 |
                                                                                 +--- NULL



-----------------------------------------------------------------------------------------------------
delete SNAP3
LVOL0 --INT4--+--- Base4
              |
          |
          +--- INT3(SNAP4)--+--- Base3
                                |
                            |    
                            +--- INT2(SNAP3)--+--- Base2
                                                  |
                                              |
                                              +--- INT1(SNAP2)--+--- Base1
                                                                    |
                                                                |
                                                                +---INT0(SNAP1)--+--- Base0
                                                                                     |
                                                                                 |
                                                                                 +--- NULL
delete SNAP3 (delete INT2, delete Base2)                                             
update I/O channels INT3
delete alias SNAP3

LVOL0 --INT4--+--- Base4
              |
          |
          +--- INT3(SNAP4)--+--- Base3
                                |
                            |    
                            +--- INT1(SNAP2)--+--- Base1
                                                  |
                                              |
                                              +---INT0(SNAP1)--+--- Base0
                                                                   |
                                                               |
                                                               +--- NULL