Table 5. Hot-swap I/O module types by location for redundancy (continued)
Bays I/O-module function Permissible I/O module

3 and 4 Network connections 3 and 4 (for all

I/O expansion options on blade
servers in the BladeCenter T unit)
One of the following combinations.

v Two Ethernet switch modules

v Two Fibre Channel switch modules

v Two pass-thru modules

Important:
v The modules used must support the
network interface that is used on the
blade server I/O expansion options.
v The I/O modules in bays 3 and 4

must be the same type.

Notes:
1. The enumeration of the Ethernet controllers in a blade server is
operating-system dependent. You can verify the Ethernet controller designations
that a blade server uses through your operating-system settings.
2. The routing of an Ethernet controller to a particular I/O-module bay depends on
the type of blade server. You can verify which Ethernet controller is routed to
which I/O-module bay by using the following test:
a. Install only one Ethernet switch module or pass-thru module, in I/O-module
bay 1.
b. Make sure that the ports on the switch module or pass-thru module are
enabled (I/O Module Tasks ” Management ” Advanced Management in
the management module Web-based user interface).
c. Enable only one of the Ethernet controllers on the blade server. Note the
designation that the blade server operating system has for the controller.
d. Ping an external computer on the network that is connected to the switch
module or pass-thru module.
If you can ping the external computer, the Ethernet controller that you enabled
is associated with the I/O module in I/O-module bay 1. The other Ethernet
controller in the blade server is associated with the I/O module in I/O-module
bay 2.
3. If you have installed an I/O expansion option on a blade server, communications
from the option are routed to I/O-module bays 3 and 4. You can verify which
controller on the option is routed to which I/O-module bay by performing the test
in note 2, using a controller on the I/O expansion option and a compatible
switch module or pass-thru module in I/O-module bay 3 or 4.
Use the instructions in this section to remove or install an I/O module at the rear of
the BladeCenter T unit.

Chapter 4. Setting up the BladeCenter T hardware 61