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each server to attach to the same virtual LAN or subnet. Either one of the
integrated Ethernet controllers can be configured as the primary Ethernet controller.
If you have configured the controllers for failover and the primary link fails, the
secondary controller takes over. When the primary link is restored, the Ethernet
traffic switches back to the primary Ethernet controller. (See the operating-system
device-driver documentation for information about configuring for failover.)
Important: To support failover on the blade server Ethernet controllers, the Ethernet
switch modules in the BladeCenter unit must have identical configurations.
Blade server Ethernet controller enumeration
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 the operating-system settings.
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:
1. Install only one Ethernet switch module or pass-thru module in I/O-module bay
2. Make sure that the ports on the switch module or pass-thru module are enabled
3. Enable only one of the Ethernet controllers on the blade server. Note the
4. Ping an external computer on the network connected to the switch module or
If you have installed an I/O-expansion card in the blade server, communications
from the expansion card are routed to I/O-module bays 3 and 4, if these bays are
supported by your BladeCenter unit type. You can verify which controller on the
card is routed to which I/O-module bay by performing the same test and using a
controller on the expansion card and a compatible switch module or pass-thru
module in I/O-module bay 3 or 4.
Configuring a RAID array
Configuring a SAS RAID array applies to a blade server and MPE where a SAS
hard disk drive is installed in both the blade server and the MPE unit.
Two SAS hard disk drives can be used to implement and manage RAID level-0
(striping) or RAID level-1 (mirror) arrays in operating systems that are listed on the
ServerProven list at http://www.ibm.com/servers/eserver/serverproven/compat/us/.
Use the LSI Configuration Utility program to configure the SAS RAID (see "Using
the LSI Logic Configuration Utility program" on page 52).
If an optional BladeCenter Storage Expansion Unit 3 is installed, you can use it to
control all of the SAS hard disk drives installed in the blade server. You enable this
feature using the Configuration/Setup Utility program (see "Using the
Configuration/Setup Utility program" on page 44).
1.
(click I/O-module Tasks → Management → Advanced Management in the
management module Web-based user interface).
designation that the blade server operating system has for the controller.
pass-thru module. If you can ping the external computer, the Ethernet controller
that you enabled is associated with the switch module or pass-thru module in
I/O-module bay 1. The other Ethernet controller in the blade server is
associated with the switch module or pass-thru module in I/O-module bay 2.
Chapter 4. Configuring the blade server
51
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