AIX operating system

AIX operating system. AIX is a proprietary series of Unix operating systems developed and sold by IBM for several of its platforms, most notably the POWER-based IBM Power Systems and the legacy System/370, System/390, and zSeries mainframes. Originally derived from IBM's RT PC and 6150 systems, it has evolved into a robust, highly available platform integral to enterprise IT infrastructures worldwide, known for its advanced logical volume management, object-oriented system management, and strong security features.

History

The development of this operating system began in the mid-1980s at IBM's development labs in Austin, Texas, with the first version released for the IBM RT PC in 1986. Its design was heavily influenced by UNIX System V and incorporated features from BSD, aiming to create a commercial, standards-compliant Unix for IBM's new hardware. A pivotal moment came with the introduction of POWER processors and the RS/6000 workstation line in 1990, which established it as a premier platform for technical and commercial applications. Throughout the 1990s and 2000s, it was ported to other architectures like the ESA/390 and played a key role in the formation of the Open Software Foundation and the development of technologies like DCE/RPC. Its evolution has been closely tied to the IBM Power Systems hardware roadmap, emphasizing binary compatibility and long-term support for enterprise customers.

Features

This operating system is renowned for its sophisticated system management tools, including the System Management Interface Tool (SMIT) and the later IBM Systems Director. It pioneered advanced features such as the Journaled File System (JFS), which supports fast filesystem recovery, and a dynamic Logical Volume Manager (LVM) allowing for flexible storage allocation. Security is a cornerstone, with integration of features like Trusted AIX, Role-based access control (RBAC), and robust auditing capabilities. It also includes advanced workload management (WLM) for resource control, support for 64-bit computing, and the Dynamic LPAR capability on IBM Power Systems, enabling the creation and management of multiple virtual systems on a single physical server. Its reliability is enhanced by features like concurrent kernel updates and hot swap capabilities for various components.

Architecture

The system is built on a Monolithic kernel that supports Symmetric multiprocessing (SMP) and is optimized for the POWER and PowerPC instruction set architectures. Its kernel includes an extensible Virtual file system (VFS) layer and was one of the first commercial Unix systems to incorporate a fully integrated Object Data Manager (ODM), a database that stores system configuration information. The memory management unit utilizes a segmented-page design for efficient virtual memory management. It supports multiple application binary interfaces, including the original PowerOpen Environment (POE) and later the Linux application compatibility layer through IBM AIX Toolbox for Linux Applications. The overall architecture is designed for scalability, from single-processor systems to large IBM Power Systems clusters, and integrates closely with IBM hardware technologies like the POWER Hypervisor.

Versions

Major releases have historically aligned with new IBM hardware introductions. Significant versions include AIX 3, which established the platform on the RS/6000; AIX 4, which introduced 64-bit support and the Common Desktop Environment (CDE); and AIX 5L, which added support for Linux applications and advanced Logical partitioning (LPAR) features. AIX 6, announced in 2007, brought major security enhancements with Trusted AIX and Workload Partitions (WPARs). The current generation, AIX 7, first released in 2010, introduced features like Active Memory Sharing and maintains binary compatibility with applications from AIX 5.3. Updates are delivered via Technology Levels (TL) and Service Packs (SP), with long-term support cycles typical for enterprise operating systems. Each version has added support for newer POWER processor generations, such as the POWER7, POWER8, and POWER9.

Related software

A rich ecosystem of software supports this platform, including IBM's own DB2, WebSphere Application Server, and Cognos business intelligence suite. It is a primary platform for enterprise applications from SAP, Oracle Database, and JD Edwards. Development tools include the XL C/C++ and Fortran compilers, and the Rational application development suite. System management is often integrated with higher-level frameworks like Tivoli (now part of IBM Cloud Pak for Multicloud Management) and IBM PowerVC for virtualization management. The IBM AIX Toolbox for Linux Applications provides many GNU and open-source packages, such as Apache HTTP Server, PHP, and Python, enhancing its utility for modern workloads.

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