AS/400e Advanced Technology
56 AS/400e System Handbook
hardware in PowerPC mode, computationally intensive applications use the processor
without any additional layers of overhead.
AS/400 PASE is not an operating system. It uses the SLIC kernel for system services. A UNIX
application is fully integrated with AS/400e system work management, security, backup, file
systems, and database.
AS/400 PASE applications are created on an AIX workstation and executed on AS/400
e-series hardware (September 1997 and following systems). The current V4R5/V4R4
environment provides libraries containing more than 900 basic system APIs that are
compatible with current AIX 4.2.1 releases that provide 32-bit support. Future releases will
continue to add more APIs that are compatible with current AIX releases.
DB2 UDB for AS/400 is the database available on the AS/400e system. All applications using
database in ILE or AS/400 PASE are ported to DB2 UDB for AS/400. AS/400 PASE contains
the same Call Level Interface (CLI) set of APIs for DB2 UDB AS/400 that is supported for ILE.
Data returned from DB2 UDB AS/400 can be presented in ASCII format, which is expected by
the majority of UNIX applications. Embedded SQL is not currently available for AS/400 PASE,
because PASE executables are built on AIX.
AS/400 PASE applications can be fully integrated with other AS/400e applications, for
example, an ERP application implemented in an ILE or a WebSphere application written in
Java. A suite of applications can run together in a job mix or be separated into their own
logical partitions, depending on the performance and scheduling requirements of the
customer.
AS/400e customers that run applications ported using AS/400 PASE do not use UNIX system
operations. AS/400 PASE applications run in AS/400e jobs using standard work management
(subsystems), the AS/400e integrated file system with standard save/restore operations, and
standard AS/400e security. AS/400 PASE introduces no special system operations, only new
applications.
In V4R4, AS/400 PASE provides a broad subset of AIX 4.2.1 functionality, such as standard C
and C++ runtime (both thread safe and non-thread safe), non-thread safe Fortran runtime,
pthreads threading package, iconv services for data conversion, bsd equivalent support,
X Windows client support, and a database access library.
More information can be found on the Web at:
http://www.as400.ibm.com/developer/factory/pase/
Reliable, Managed Availability
The AS/400 system has a long history of designing key functions into the hardware and
software which add to the reliability of the system. High availability is one reason to select a
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