iSeries Architecture: Fundamental Strength of the iSeries 27
iSeries Architecture: Fundamental Strength of the iSeries
• Clusters: Cluster technology is implemented to reduce downtime due to planned
outages and site disasters. System availability during planned outages contributes to
an increase of unplanned outage coverage.
iSeries clustering took a major step forward with the introduction of Cluster Resource
Services (APIs) as part of OS/400 V4R4. OS/400 handles the complexity of managing
systems in a cluster and keeps track of data and applications. Simple cluster
management is provided with the Simple Cluster Management GUI, which is part of
Operations Navigator in V5R1. Advanced cluster management and enhanced data
resilience applications are available from cluster middleware business partners to
complete the total high availability solution.
Significant new capabilities with V5R1 include Independent Auxiliary Storage Pools
(IASPs), which allow access to Integrated File System data that is independent of the
System ASP and other User ASPs. Refer to “Clustering” on page 479.
• Applications - ClusterProven: A high availability solution for the iSeries server
involves the active participation of cluster middleware business partners. The partners
provide advanced cluster management and data resiliency tools. Solution developers
design applications to maintain the state of an application across an outage.
• Availability services and support: As a world leading enterprise computing vendor,
IBM has a collection of products and services to assist the customer to develop and
maintain a high availability environment.
Linux for iSeries
IBM supports your choice of platform and operating systems, a commitment now extended to
include Linux, the open-source operating system. Linux can enable a new stream of
e-business applications to complement the strengths of the iSeries as an integrated core
business solution. Linux inherits important strengths and reliability features of the iSeries
architecture.
iSeries is enhanced to support Linux running in a secondary logical partition. The primary
partition runs OS/400 V5R1. Up to 31 Linux partitions are supported depending on the
iSeries model. See “Linux for iSeries” on page 477 for more details.
High Speed Links (HSL)
A new bus structure using High Speed Links (HSL) provides a faster data transportation
mechanism for the iSeries 270 and 8xx models. These new systems have faster processors,
more on-chip cache, a faster memory bus, a super fast cross-bar switch complex (with
speeds
up to 43.2 GB per second
), faster DASD, and much faster IOPs and IOAs. New fibre
channel adapters step the iSeries into the world of SAN.
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