Pos 355 Introduction To Operation Systems
A mainframe is a state-of-the-art computer for mission critical tasks. In the "ancient" mid-1960s, all computers were mainframes, since the term referred to the main CPU cabinet. Today, it refers to a class of ultra-reliable medium and large-scale servers designed for enterprise-class and carrier-class operations.
IBM owns the mainframe business. Although many tried to compete by offering compatible mainframes that ran the same IBM applications, only Amdahl (Fujitsu) has remained as a competitor in this arena Unisys, Sun and others make mainframe-class machines, but run under proprietary or Unix-based operating systems, not IBM operating systems.
Why do mainframes cost a million dollars or more when the raw gigahertz (GHz) rating of their CPUs is no higher than a PC costing 1,000 times less. Quite often in fact, the ratings are lower. Here are the reasons.
Mainframes support symmetric multiprocessing (SMP) with as many as 32 central processors in one system. They are highly......
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Pos 355 Introduction To Operation Systems
POS 355 Introduction to operation systems. A mainframe is a state-of-the-
art computer for mission critical tasks. In the "ancient ...
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