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Chapter 4: Subsystem Connection and Operation

FC Host Connection Prerequisites

4-3

4.1.5 Points of Failure

The primary concern for configuring host-side topologies is that points of failure are

avoided. It is therefore recommended that the host side be connected to at least two (2)

HBAs. By-pass circuitry should be provided outside the subsystem; therefore, it is also

preferable to connect the FC RAID subsystems to the host computer(s) through FC-4G

Fibre switches.

NOTE:

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

failover software on the host computer to re-direct data flow in the event of single path

failure.

4.1.6 Sample Topology – Clustered Hosts

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

clustered servers. Data path redundancy makes sense when the following configurations

are available:

1. These two computers are clustered.

2. HA access software control is available.

3. The same storage volume(s) are made available on both host ports. The surviving

computer can access the array in the event of single computer failure.

Figure 4-1: Sample Topology Including Clustered Servers and One Subsystem

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

connected to two separate host computers.

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Rorke Data The Galaxy 65 Specifiche Pagina 59