Chapter 8. Establishing an HACMP infrastructure on AIX 419
򐂰 System dump enhancements
򐂰 DVD support for system dumps
򐂰 snap command enhancements
Trace enhancements
These enhancements include:
򐂰 Administrative control of the user trace buffers
򐂰 Single thread trace
System management
AIX 5L provides many enhancements in the area of system management and
utilities. This section discusses these enhancements. Topics include:
򐂰 InfoCenter for AIX 5L Version 5.3
򐂰 Multiple desktop selection from BOS menus
򐂰 Erasing hard drive during BOS install
򐂰 Service Update Management Assistant
򐂰 Long user and group name support
򐂰 Dynamic reconfiguration usability
򐂰 Paging space garbage collection
򐂰 Dynamic support for large page pools
򐂰 Interim Fix Management
򐂰 List installed filesets by bundle
򐂰 Configuration file modification surveillance
򐂰 DVD backup using the mkdvd command
򐂰 NIM security
򐂰 High Available NIM (HA NIM)
򐂰 General NIM enhancements
8.2 HACMP overview
This overview contains an introduction to IBM High Availability Cluster
Multi-Processing (HACMP) for AIX product line, and the concepts on which
IBM’s high availability products are based. It is essential that the reader fully
understand how HACMP works, and what HACMP is designed to deliver with
regard to availability.
We discuss the following topics:
򐂰 What is HACMP?
򐂰 HACMP concepts
򐂰 HACMP terminology
420 IBM Tivoli Storage Manager in a Clustered Environment
8.2.1 What is HACMP?
IBM’s high availability solution for AIX, High Availability Cluster Multi Processing,
based on IBM’s well-proven clustering technology, consists of two components:
򐂰 High availability: The process of ensuring that an application is available for
use through the use of duplicated and/or shared resources
򐂰 Cluster multi-processing: Multiple applications running on the same nodes
with shared or concurrent access to the data
A high availability solution based on HACMP provides automated failure
detection, diagnosis, application recovery, and node reintegration. With an
appropriate application, HACMP can also provide concurrent access to the data
for parallel processing applications, thus offering excellent horizontal scalability.
A typical HACMP environment is shown in Figure 8-1.
Figure 8-1 HACMP cluster
HACMP Cluster
pSeries
Node
Node
A
A
pSeries
Network ethernet
Serial network
Node
Node
B
B
Resource Group
Application_01
Volume Groups
File system s
hdisk1
hdisk1
hdisk2
hdisk2
hdisk3
hdisk3
hdisk1
hdisk1
hdisk2
hdisk2
hdisk3
hdisk3
Resource Group
Application_02
Volume Groups
File systems

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