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Chapter 2. Cluster Planning
The area of cluster planning is a large one. Not only does it include planning
for the types of hardware (CPUs, networks, disks) to be used in the cluster,
but it also includes other aspects. These include resource planning, that is,
planning the desired behavior of the cluster in failure situations. Resource
planning must take into account application loads and characteristics, as well
as priorities. This chapter will cover all of these areas, as well as planning for
event customizations and user id planning issues.
2.1 Cluster Nodes
One of HACMP's key design strengths is its ability to provide support across
the entire range of RISC System/6000 products. Because of this built-in
flexibility and the facility to mix and match RISC System/6000 products, the
effort required to design a highly available cluster is significantly reduced.
In this chapter, we shall outline the various hardware options supported by
HACMP for AIX and HACMP/ES. We realize that the rapid pace of change in
products will almost certainly render any snapshot of the options out of date
by the time it is published. This is true of almost all technical writing, though
to yield to the spoils of obsolescence would probably mean nothing would
ever make it to the printing press.
The following sections will deal with the various:
• CPU Options
• Cluster Node Considerations
available to you when you are planning your HACMP cluster.
2.1.1 CPU Options
HACMP is designed to execute with RISC System/6000 uniprocessors,
Symmetric Multi-Processor (SMP) servers and the RS/6000 Scalable
POWERparallel Systems (RS/6000 SP) in a no single point of failure server
configuration. The minimum configuration and sizing of each system CPU is
highly dependent on the user's application and data requirements.
Nevertheless, systems with 32 MB of main storage and 1 GB of disk storage
would be practical, minimum configurations.
Almost any model of the RISC System/6000 POWERserver family can be
included in an HACMP environment and new models continue to be added to
the list. The following table gives you an overview of the currently supported
© Copyright IBM Corp. 1999
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