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5: Cabling
Connecting the System to the Host(s)
You can connect your system to a host computer (or multiple host computers) in many
ways. The following figures show typical examples of connecting either by direct
connect or fabric connect. All examples assume dual-controller high-availability (HA)
configurations. The following topics are covered:
• “Example of Direct Host Connection Cabling” on page 74
• “Example Fabric/Switch Host Connection Cabling” on page 77
• “Connecting Ethernet and Serial Cables for Array Management” on page 77
Warning: Electrostatic discharge can damage sensitive components. Use
appropriate antistatic precautions before handling any components.
For maximum hardware redundancy, you must install a minimum of two HBAs in each
host. Dual-ported HBAs give you two paths into the storage array but do not ensure
redundancy if the entire host bus adapter fails.
Example of Direct Host Connection Cabling
The SGI InfiniteStorage 4000 system can be connected directly to as many as four hosts.
These connections can be configured with or without failover. Failover is a method of
transferring I/O requests from one controller to another when a component failure or
other error occurs on the data path to the first controller. Depending on the operating
system of your host(s), you may be able to choose from several failover options.
Note: If the host’s operating system does not support failover, the host can only be
connected to one controller. See Figure 5-9.
The following sections contain more information:
• “Switched-Host Connection With HBA Failover” on page 76
• “Example Fabric/Switch Host Connection Cabling” on page 77
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