Diagrams do not need to be confined to network topologies. They can also represent ideas and concepts of a system. For example, we can use a logical diagram to detail each abstract layer so that we can easily understand the system as a whole. Figure 3.12 shows a complex SAN and how the disks are allocated to two RAID groups. The RAID groups are then combined, and the usable space is partitioned to LUNs and allocated to systems. Although the concepts in the drawing are out of the scope of this book, the diagram serves as a logical diagram with each layer that makes up the configuration of our SAN.
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