iSeries Architecture: Fundamental Strength of the iSeries 25
iSeries Architecture: Fundamental Strength of the iSeries
OS/400 Portable Application Solutions Environment
The OS/400 Portable Application Solutions Environment (OS/400 PASE) is a technology
designed to expand the iSeries solutions portfolio. OS/400 PASE is an integrated runtime that
provides simplified porting of selected solution provider UNIX applications.
The broad base of iSeries server applications are continually enhanced by new applications
coming to the platform from a variety of sources. Until recently, the iSeries servers’ Integrated
Language Environment (ILE) accounted for the majority of C or C++ applications ports, many
originating on UNIX systems. Other applications have UNIX system-specific requirements or
are designed for highly compute intensive demands that favor a UNIX runtime. With the latest
addition of OS/400 PASE, ISVs can rapidly port UNIX applications to the iSeries and take
advantage of the extensive iSeries architecture.
OS/400 PASE provides a broad set of AIX interfaces, in a runtime that allows selected UNIX
application binaries to run directly on the PowerPC processor of the iSeries server.
Refer to “PASE (Portable Application Solutions Environment) (5722-SS1 Option 33)” on
page 494. You can also find more information on the Web at:
http://www.iseries.ibm.com/developer/factory/pase/index.html
Reliable, Managed Availability
The iSeries server has a reliable history of designing key functions into the hardware and
software. High availability is one reason to select a managed availability approach. Other
reasons include minimal disruptive backup solutions and the ability to non-disruptively install
and pre-test new versions, releases, or software fixes to make optimum use of all company
and system resources.
Hallmarks of iSeries availability include redundant internal hardware features, such as
RAID-5 and mirroring. The robustness and stability of OS/400 extends into its multiple,
subsystem support (batch, interactive, multi-language, applications). The iSeries server
offers managed availability to ensure that it is ready to do business when you are.
iSeries managed availability software is also called
cross-system mirroring
. It provides:
• The ability to have one system act as a “hot” backup system to one or more primary
systems. The primary and secondary systems do not have to be the same size or
model.
• A rapid switchover to the secondary machine in the event of an emergency.
• System backup that allows data from the primary system to be completely backed up
after only a few minutes of down time. While the secondary system has a “static” copy
of the “primary” system’s data, the primary system continues to operate. Changes are
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