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Galaxy GHDX-2422S-8+12F4D Installation and Hardware Reference Manual

FC Host Connection Prerequisites

4-4

♦ Redundant Data Paths: In the configuration shown in Figure 4-1, the data paths are

redundant. If either of these data paths fails, I/O traffic will be transmitted along the

alternative path. If one of the host computers fails, the second host computer that is

connected to the subsystem can resume the operation of the subsystem.

NOTE:

To create dual-redundant data paths on the host side, it is necessary for third-party

failover software to be installed on the host computer.

4.1.7 Sample Topology – Direct-Attached

In the configuration shown in Figure 4-2, one (1) subsystem is connected to a single host

computer. Data path redundancy makes sense when the following configurations are

available:

1. HA access software control is available.

2. Storage volume(s) are presented on either of the host ports. The host management

software should direct all data flow through a surviving path in the event of single

path failure.

Figure 4-2: Sample Topology Includes Single Host and One Subsystem

♦ Connections: The input ports on the subsystem, FC-CH0 and FC-CH1, are

connected to two separate HBAs on a server.

♦ Redundant Data Paths: In the configuration shown above, the data paths are

redundant. If either of these data paths fails, I/O traffic will be transmitted along the

alternate path.

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