cables to connect one storage expansion enclosure to another in a daisy-chain. For
more information, see “Connecting storage expansion enclosures to the DS5100
and DS5300” on page 60.
The DS5100 and DS5300 also supports 1 Gbps iSCSI connectivity. The host iSCSI
connections provide an iSCSI path for host attachment. The connections can
consist of Cat6 Ethernet cables, host bus adapters with iSCSI initiators, or an
Ethernet adapter with Gigabit Ethernet switches and RAID controllers. See “iSCSI
configurations” on page 118 for more information about iSCSI configurations.
Note: A host cannot be connected to a DS5100 and DS5300 through both the FC
and iSCSI host ports.
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 DS5100 and DS5300 configuration is eight partitions. Up to
512 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 DS5100 and DS5300 host fibre channel
configurations.
DS5100 and DS5300 host configurations: This section provides the following
examples of DS5100 and DS5300 host fibre channel configurations:
v Redundant host and drive fibre channel loop configurations, as shown in
Figure 77 on page 116
v Single SAN fabric configuration, as shown in Figure 79 on page 117
v Dual SAN fabric configuration, with an additional DS5100 and DS5300 attached,
as shown in Figure 80 on page 117
v Two clusters, as shown in Figure 81 on page 118
Notes:
1. These configurations have host and drive path failover protection and are best
practices for high availability.
2. The following illustrations do not accurately represent the controller locations in
the DS5100 and DS5300.
Figure 77 on page 116 is an example of one host system to one, and two host
systems without switches to one. Figure 78 on page 116 is an example of a
redundant SAN fabric channel configuration.
Chapter 3. Cabling the storage subsystem 115
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