The IBM Power Systems are the server systems from IBM with an open power architecture and have been in use since 2008. Before that, IBM had the IBM System I and the IBM System P. The IBM System I ran with i5 / OS and OS / 400 while the IBM System P was used with AIX or Linux. Since there were little differences in the hardware, both systems were combined to form the IBM Power Systems. The IBM Power Systems are often referred to as the IBM Power-System I. Even if the designation IBM Power System I is not entirely correct, it is still a reference to the origin of the original IBM System I and IBM System P. For the older systems there are also designations such as IBM iSeries. You can write it how you want, whether I Series, iSeries, IBM I Series or IBM ISeries, they are the forerunners of today's IBM Power Systems that have completely replaced the former IBM I Series. The IBM Power Systems offer high performance with a simple management system. Right from the start, the aim was to provide a high level of quality and power for a wide variety of applications and storage systems in order to meet the requirements of a performance-hungry large company. This goal was achieved and exceeded, because not only was performance combined in the system at a reasonable price, but a high level of security was also integrated.