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Switched Fabric Connection (Dual-Controller)
NOTE
A logical partition presented through LUN Mapping can be seen by all servers across
SAN. Make sure you have access control such as file-locking, switch zoning, port
binding, etc., to avoid access contention.
Channels
Controller A
Controller B
Host
CH0, CH1, CH2, CH3
CH0, CH1, CH2, CH3
Configuration Information
Controller
2
Host server
4 (or more via FC switches)
FC switch
2 (or 1 into 2 zones)
Data path connection
Fault-tolerant paths
Channel link bypass is provided on external FC switches. Each of the application servers
shown in the diagram is equipped with two HBAs with FC links via two FC switches to the
SFP ports on individual controllers.
You can refer to the ID tags on the host links to see the related logical volume mapping and
cable links routing paths. Through the cable links illustrated above, the configuration can
withstand a failure of a single component, e.g., controller, HBA, cable, or FC switch.
Each logical partition is redundantly mapped to multiple host channel IDs in an AAPP (Active-
Active-Passive-Passive) configuration. Logical volumes are managed either by the controller
