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Chapter 3. Availability, investment
protection, and expansion
The following sections provide more detailed information about configurations, upgrades, and
design features that will help you lower your cost of ownership.
3.1 High availability solution
For even greater availability and reliability, the Models 6C1 and 6E1 also support IBM® High
Availability Cluster Multiprocessing (HACMP) software, the leading UNIX disaster recovery
clustering solution. This solution, when combined with applications that meet IBM
clusterProven standards, provides a superior base for high availability, an essential ingredient
of e-commerce.
3.2 Reliability, availability, and serviceability (RAS) features
RAS features, such as redundant power supplies or N+1 hot-plug fans, are important for the
availability of your server. A few RAS features of the Models 6C1 and 6E1 are covered in the
next sections. At the time of writing there are other additional RAS features available in some
specific pSeries systems that are not supported in the Models 6C1 and 6E1. They are listed
as follows:
Chipkill Chipkill™ memory is a technology from IBM that
protects a server from any single memory chip
failure and multibit errors from any portion of a
single memory chip. Memory chip failures can
cause server system crashes that can result in the
permanent loss of business data.
Dynamic Processor Deallocation The capability of Dynamic Processor Deallocation
is only active in systems with more than two
processors, because device drivers and kernel
extensions, which are common to multi-processor
and uniprocessor systems, would change their
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