AS400 vs iSeries
The terms AS400 and iSeries are often used interchangeably, but they refer to different stages in the evolution of IBM’s midrange computing systems. The AS400, introduced in 1988, was IBM’s groundbreaking platform designed for reliability, scalability, and enterprise application support. It integrated hardware, an operating system (OS/400), and a database into one unified system. In the early 2000s, IBM rebranded the AS400 as iSeries, bringing enhanced capabilities, improved processing power, and support for modern technologies. The rebranding also introduced features like LPAR (Logical Partitioning) to optimize resource utilization. Despite the name changes, both systems remain popular for running critical business applications, thanks to their reputation for stability, backward compatibility, and robust performance.