5-20-topo

     +--+------+-+-------+-+
     |  |      | |       | |
     |  | LUN0 | | LUN1  | |
     |  |      | |       | |
     |  +-XX---+ +---X---+ |
     |    XXXX     XXX     |
     |    X  XXX XXX X     |
     |    X    XXX   X     |
     |    X  XXX XXX X     |
     |    XXXX     XXX     |
     |  iqn1        iqn2   |
     |    +-----------+    |
     |    |  LIO      |    |
     |    |(targetcli)|    |
     |    +-XX------XX+    |
     |     XX        XX    |
     +---XX-----------XX---+
        XX             XX
      XX                XX
     XX                  XXX
    XX                     XX
+--------+-------------+---------+
| sda    |             |  sdc    |
+--------XXX           X---------+
+---------  XX       XX----------+
| sdb    |   XX     XX |  sdd    |
+-----X--+    X    XX  +-X-------+
|     XX      X   XX    XX       |
|      XX     X   X    XX        |
|   +----------+  +----------+   |
|   |  mpatha  |  | mpathb   |   |
|   +----------+  +----------+   |
|                                |
|                                |
|                                |
+--------------------------------+