Chapter 3. Cluster Hardware and Software Preparation
This chapter covers the steps that are required to prepare the RS/6000 hardware and AIX software for the installation of HACMP and the configuration of the cluster. This includes configuring adapters for TCP/IP, setting up shared volume groups, and mirroring and editing AIX configuration files.
3.1 Cluster Node Setup
The following sections describe important details of cluster node setup.
3.1.1 Adapter Slot Placement
For information regarding proper adapter placement, see the following documentation:
•PCI Adapter Placement Reference Guide,
•Adapters, Devices, and Cable Information for Micro Channel Bus Systems,
•Adapters, Devices, and Cable Information for Multiple Bus Systems,
3.1.2Rootvg Mirroring
Of all the components used to build a computer system, physical disk devices are usually the most susceptible to failure. Because of this, disk mirroring is a frequently used technique for increasing system availability.
File system mirroring and disk mirroring are easily configured using the AIX Logical Volume Manager. However, conventional file system and disk mirroring offer no protection against operating system failure or against a failure of the disk from which the operating system normally boots.
Operating system failure does not always occur instantaneously, as demonstrated by a system that gradually loses access to operating system services. This happens as code and data that were previously being accessed from memory gradually disappear in response to normal paging.
Normally, in an HACMP environment, it is not necessary to think about mirroring the root volume group, because the node failure facilities of HACMP can cover for the loss of any of the rootvg physical volumes. However, it is possible that a customer with
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