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Secondary
blade
Primary
server
blade
server
• Multiple partitions (independent partitions). The blade servers are combined into a scalable blade
complex, but each of the blade servers is set up as a single partition.
• Stand-alone mode. The blade servers operate independently.
Important: If you install the primary blade server of a scalable blade complex in blade server bay 7 of a
BladeCenter H Type 8852 chassis, the secondary blade server is installed in blade server bay 8. The primary
blade server receives power from power domain 1 of the chassis and the secondary blade server receives
power from power domain 2 of the chassis. The following situations can occur if there is a power loss to
either power domain, depending on how the scalable blade complex is implemented:
• If the scalable blade complex is implemented in single partition mode, a loss of power to power domain 1
or power domain 2 results in both blade servers in the scalable blade complex going down.
• If the scalable blade complex is implemented in stand-alone mode, a loss of power to power domain 1
results in the entire scalable blade complex going down. A loss of power to power domain 2 results in the
blade server installed in blade server bay 8 going down, but the blade server installed in blade server bay
7 continues to function.
With FlexNode processing, you can toggle between single partition mode and stand-alone mode without
having to modify the physical setup of the blade servers. To toggle between modes, use the advanced
management module web interface.
For example, assume that you have created a scalable blade complex and defined that complex as a single
partition through the advanced management module web interface:
• You can toggle the scalable blade complex to stand-alone mode through the web interface. In stand-
alone mode, you can install a different operating system on each blade server and run different
applications on each blade server.
• You can then toggle the blade server complex back to a single partition and run applications that take
advantage to up to 4 processors and 32 DIMMs. The operating system that is in use is the operating
system of the primary blade server.
• Later, you can toggle the complex back to stand-alone mode again to gain access to the operating
system on the secondary blade server.
.
13
Chapter 1
Introduction
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