System information

10 Deploying Samba on IBM Eserver BladeCenter
Figure 1-7 BladeCenter 1200W Power Supply Module
Power Modules 3 and 4 are required to provide power to blade slots 7 to 14. Figure 1-8 on
page 11 shows how power is distributed by each power module. One power module is
capable of providing enough power in the event of a power module failure. Power module 2
provides redundancy for power module 1 and power module 4 does the same for power
module 3, although these power modules will effectively share the load under normal
operating conditions. Supported configurations require either two or four power supplies,
which is why when you order the optional BladeCenter 1200W Power Supply Module kit, you
will receive two of the power modules.
BladeCenter power module upgrade guidelines
This section contains information that will help you determine whether you need to upgrade
the power modules in your IBM ^ BladeCenter unit when installing IBM ^
BladeCenter HS20 blade servers.
As of the date of this printing, three BladeCenter power-module options are available: IBM
BladeCenter 1200W Power Supply Module (part number 48P7052), IBM BladeCenter 1200W
to 1400W Power Supply Upgrade Kit (part number 90P0197), and IBM BladeCenter 1800W
Power Supply Module (part number 13N0570). Go to
http://www.ibm.com/pc/compat/ for
information about ordering these options. Obtain and use the Technical Update with your
BladeCenter and blade server documentation for future reference.
Important: Nonredundant power is not supported in BladeCenter products. Power
modules must always be present in power bays 1 and 2. When any blade server or option
is in blade bay 7 through 14, power modules must be present in power bays 1 and 2, as
well as in power bays 3 and 4. If a power module fails or an ac power failure occurs,
BladeCenter units configured for redundant power operation, as described in this
document, will operate in a nonredundant mode, and the blower modules will run at full
speed. You must replace the failing power module or restore ac power as soon as possible
to regain redundant power operation and to reset the blower modules to their normal
operating speed.