San And Network Setup - IBM TotalStorage DS300 Best Practices Manual

The BladeCenter module bays 1 and 2 are populated with D-Link gigabit ethernet
switch modules. One of two ports of the onboard network adapter is used to
access the public LAN. the other port is not used. Module bay 3 and 4 are
populated with Nortel layer 2-3 gigabit ethernet switches. Those switches are
used to connect to the two iSCSI networks. Depending on the port type of the
external switches, pass through modules can be used as well. IBM offers a
copper pass through and an optical pass through module. The copper pass
through module can only operate at gigabit speed and can handle only ethernet.
More flexibility in terms of the possible protocols is provided by the optical pass
through module. The big advantage of the optical pass through module is the
possibility that different add on cards can be installed in the blades of the same
BladeCenter. For example a fibre channel host bus adapter can be installed in
one blade and a gigabit ethernet card in a other blade. The pass through module
provides a single cable for every port installed in a blade. This cable needs to be
connected to an external gigabit ethernet switch or a fibre channel switch. More
cabling is required than using switch modules in the module bays of the
BladeCenter, but no configuration of the pass through modules is required.
Note: When using switch modules in the module bays 3 and 4, only adapter
cards of the same type as the switch can be installed in the blades. For
example, when a gigabit ethernet switch is installed in bays 3 and 4, then only
gigabit adapter cards can be installed in the blades.
Verify the current support status before starting implementation. There might be
changes in the supported devices.

7.1.2 SAN and network setup

The following diagram shows the cabling of the components. It follows the
example configuration as explained in 6.2.2, "DS300 dual controller switched
dual path attachment" on page 219.
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IBM TotalStorage DS300 and DS400 Best Practices Guide