Blade Servers; Power Modules - IBM 8677 - BladeCenter Rack-mountable - Power Supply Installation And User Manual

Similarly, the BladeCenter unit supports two additional I/O modules in I/O-module
bays 3 and 4. Each of these I/O modules provides an internal connection to one of
the two network-interface controllers on all the I/O-expansion options that are
installed in blade servers in the BladeCenter unit. The I/O module must be
compatible with the network interface on all the I/O-expansion options. For example,
if you install a Fibre Channel I/O expansion option in a blade server, the I/O
modules that you install in I/O-module bays 3 and 4 must be Fibre Channel switch
modules or pass-thru modules.
Notes:
1. Because of electromagnetic interference (EMI), no more than two four-port 1 Gb
2. You can use a pass-thru module in any I/O-module bay, provided that the

Blade servers

The BladeCenter unit provides 14 bays for blade servers or other BladeCenter
devices. A blade server is a hot-swap, independent server, with its own processors,
memory, storage, network controllers, operating system, and applications. The blade
server slides into a bay in the BladeCenter unit and shares power, blowers,
media-tray drives, switches, and ports with other blade servers.

Power modules

The BladeCenter unit comes with two to four hot-swap power modules.
The following table summarizes the application for each power module.
Power modules are not needed in bays 3 and 4 until you begin installing blade
servers and options in blade bays 7 through 14.
Note: If you install a blade server in blade bay 6 that spans two bays or that has
Each pair of power modules is redundant, depending on power-management
settings. If either power module fails, the remaining power module continues to
supply power, but there is no redundancy; the failed power module must be
replaced as soon as possible.
Important:
1. The power modules in a pair must match each other in capacity (wattage).
2. For power redundancy, you must connect the power-module pairs (1 and 3, or 2
Ethernet switch modules can be installed in the BladeCenter unit. You can mix
four-port 1 Gb Ethernet switch modules with other supported Ethernet switch
modules to achieve the total number of Ethernet switch modules that you need
in the BladeCenter unit.
associated controller in the blade servers or I/O expansion options is compatible
with it.
Bays Power module function
1 and 2 Provides power to all the BladeCenter modules and to blade bays 1 through 6
3 and 4 Provides power to blade bays 7 through 14
an attached expansion unit, power modules are required in all four power
bays.
and 4) to different ac power sources that are controlled by separate circuit
breakers. For example, when one ac power source fails, the second ac power
source handles the power load for the BladeCenter unit.
7
Chapter 1. Introduction