+--------+   +--------+   +--------+
|        |   |        |   |        |
| Server1|-->| Data   |<--| Server2|
|        |   | Base   |   |        |
+--------+   +--------+   +--------+
                 ^
                 |
             +--------+
             |        |
             | Server3|
             |        |
             +--------+

+--------+   +--------+   +--------+   +--------+
|        |   |        |   |        |   |        |
| Server1|-->| Data   |   | Server2|-->| Data   |
|        |   | Base   |   |        |   | Base   |
+--------+   +--------+   +--------+   +--------+
    ^                         ^
    |                         |
    +-------------------------
                 |
                 V
             +--------+   +--------+
             |        |   |        |
             | Server3|-->| Data   |
             |        |   | Base   |
             +--------+   +--------+