Q-Logic 8100 SERIES manual Single-Path Topology

8–Configuring FCoE in a Linux Environment Boot-from-SAN

Server
Adapter Port 1
Converged
Networking Switch
Controller A
Storage Array
LUN 1 Primary Boot Device	LUN 2 Alternate Boot Device
LUN 3 Alternate Boot Device	LUN 4 Alternate Boot Device

Figure 8-12. Single-Path Topology

Multipath Topology

The multipath topology provides fault tolerance through redundant SAN components: two adapter ports, two converged networking switches, and access to the boot LUNs through two independent storage array controllers. Figure 8-13shows the SAN components and their connections. The server has access to the primary and alternate boot LUNs through two independent paths. A single point of failure is unlikely with this configuration. You can enhance this configuration further by adding more adapter ports that connect to the converged networking switches. This added level of redundancy protects against adapter board failures.

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