cables, SFPs, host bus adapters, fibre-channel switches, and RAID controllers. The
redundant drive fibre-channel loop provides the fibre path from the DS4800 Storage
Subsystem to the hard disk drives (HDDs) in the storage expansion enclosures.
The redundant drive fibre-channel loop consists of the DS4800 Storage Subsystem,
the storage expansion enclosures, fibre-channel cables, and SFPs.
The DS4800 supports redundant drive channel pair configurations. You can build a
redundant drive channel pair by connecting one or more storage expansion
enclosures to the redundant RAID controllers. Then, use dual fiber-optic cables to
connect one storage expansion enclosure to another in a daisy-chain. For more
information, see “Connecting storage expansion enclosures to the DS4800” on page
59.
Fibre channel host loop configurations
You must determine how the host systems will connect to the storage subsystem.
You can connect up to four host systems directly to the storage subsystem, or you
can connect more than two hosts to the fibre channel storage subsystem through
switches. The illustrations in the following sections show common host system
configurations.
Note: The minimum DS4800 configuration is eight partitions. Sixteen-partition and
sixty-four-partition configuration upgrades are available as upgrade options.
Contact your IBM reseller or marketing representative for more information.
Redundant host and drive loops
This section provides examples of DS4800 host fibre channel configurations.
DS4800 host configurations: This section provides the following examples of
DS4800 host fibre channel configurations:
v Redundant host and drive fibre channel loop configurations, as shown in
Figure 66 on page 94
v Single SAN fabric configuration, as shown in Figure 67 on page 95
v Dual SAN fabric configuration, with an additional DS4800 attached, as shown in
Figure 68 on page 95
v Two clusters, as shown in Figure 69 on page 96
Notes:
1. These configurations have host and drive path failover protection and are
recommended for high availability.
2. The following illustrations do not accurately represent the controller locations in
the DS4800.
Figure
66 on page 94 gives an example of one host system to one DS4800; two
host systems, with fibre channel switches, to one DS4800; and, two host systems,
without switches, to one DS4800.
Chapter 3. Cabling the storage subsystem 93
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