Advanced Interactive Executive

Advanced Interactive Executive. It is a proprietary Unix operating system developed, marketed, and sold by International Business Machines Corporation for its workstation and server platforms. First released in 1986, it was designed to be a robust, high-performance system supporting symmetric multiprocessing and advanced security features. Over its history, it has been a key platform for database and enterprise applications, particularly in commercial and scientific computing environments.

History

The development was initiated at IBM in the mid-1980s, influenced by the company's work on UNIX System V and the need for a powerful operating system for its new RT PC workstation based on the ROMP microprocessor. Key figures within IBM sought to create a system that combined the openness of Unix with the reliability expected of mainframe systems. A significant milestone was its selection as the primary operating system for the IBM RS/6000 family upon its launch in 1990, which utilized the new POWER architecture. Throughout the 1990s, it became a formidable competitor to other commercial Unix systems like HP-UX and Solaris, especially in markets for technical and business applications. Its evolution has been closely tied to the development of the PowerPC and later POWER processor lines, cementing its role in IBM's server strategy alongside OS/400 and z/OS.

Architecture

The system is built around a monolithic kernel, which provides core services such as process management, memory management, and device drivers. A key architectural feature from its inception was support for symmetric multiprocessing, allowing it to efficiently utilize systems with multiple CPUs. Its virtual memory system uses a segmented and paged design, providing a large address space for applications. The kernel and core utilities were originally written primarily in the C programming language, with some performance-critical sections in Assembly language. It introduced the Journaled File System as its primary filesystem, which provided fast recovery and data integrity features. The overall design philosophy emphasized performance, scalability, and adherence to open standards like POSIX and the X/Open Portability Guide.

Features

Notable features include advanced system management tools like System Management Interface Tool, which provides a menu-driven interface for configuration. It incorporates sophisticated workload management capabilities through features like Workload Partitions, allowing for resource control and isolation. Security is a major focus, with features such as Trusted AIX, Role-based access control, and integration with LDAP directories for authentication. The system includes robust logical volume management, allowing dynamic management of disk storage and support for RAID configurations. It also provides extensive support for Java applications and includes the XL C/C++ and Fortran compilers for high-performance computing tasks.

Variants and releases

Major versions have been released periodically, with significant updates including Version 4, which introduced 64-bit support for the PowerPC architecture. A notable variant is AIX/370, which was ported to run on System/370 mainframe architecture. Another is AIX/ESA, designed for the Enterprise Systems Architecture. For the PC platform, IBM developed AIX PS/2 for its PS/2 line of computers. The operating system has also been adapted for special hardware, such as the RT/PC and early RISC System/6000 models. Each release has generally added support for newer POWER processor generations, increased scalability in terms of processors and memory, and enhanced clustering capabilities through technologies like PowerHA.

Applications and usage

It is widely deployed as a server operating system, particularly for running critical database systems like Db2, Oracle Database, and SAP applications. In the financial sector, institutions such as Bank of America and JPMorgan Chase have utilized it for transaction processing and risk analysis. It is also common in scientific and engineering environments for computational tasks, often in conjunction with Watson technologies or high-performance computing clusters. The platform has been used for major infrastructure projects, including supporting operations for companies like Boeing and NASA. Furthermore, it serves as the host operating system for the IBM Cloud and forms the base for other IBM software offerings like WebSphere Application Server and InfoSphere DataStage.

Category:IBM operating systems Category:Unix variants Category:Proprietary software