IBM DCS3700, Installation, User'S, And Maintenance Manual

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2. Create a redundant host connection by connecting a second SAS cable from a second SAS HBA (or a
second SAS port in the HBA) to a host port on controller B in the DCS3700 storage system.
The DCS3700 can support a maximum of two redundant host connections to a base DCS3700 storage
system. With the optional 6Gbps 2 port host interface card installed in each controller, a maximum of
four redundant host connection are supported.
See “Direct-attached dual-controller connections” for illustrations of host connections.
Direct-attached dual-controller connections: The following illustration shows a direct-attached
connection from each controller to a single HBA in the same host (redundant host connection).
Figure 38. Dual-controller direct-attached Fibre Channel connection to two HBAs in the same host (redundant host
connection)
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IBM System Storage DCS3700: Installation, User, and Maintenance Guide