© Copyright IBM Corp. 2010. All rights reserved. 99
Chapter 4. Continuous availability and
manageability
This chapter provides information about IBM reliability, availability, and serviceability (RAS)
design and features. This set of technologies, implemented on IBM Power Systems servers,
provides the possibility to improve your architecture’s total cost of ownership (TCO) by
reducing unplanned down time.
RAS can be described as follows:
Reliability
Reliability indicates how infrequently a defect or fault in a server manifests itself.
Availability
Availability indicates how infrequently the functionality of a system or application is
impacted by a fault or defect.
Serviceability
Serviceability indicates how well faults and their effects are communicated to users and
services and how efficiently and nondisruptively the faults are repaired.
This chapter contains the following topics:
4.1, “Introduction” on page 100
4.2, “Reliability” on page 100
4.3, “Availability” on page 101
4.4, “Serviceability” on page 109
4.5, “Manageability” on page 120
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