110Introduction to the New Mainframe: Large-Scale Commercial Computing
6.1 Introduction
The core function of a large-scale computing environment is to process
corporate data. In order for this function to be performed in an efficient manner,
access to the data is the most important consideration. This chapter discusses
the design of disk input/output (I/O) devices and how they are accessed from an
IBM System z server.
Figure 6-1 I/O connectivity
For any data processing, the program acting on it must reside in the processor’s
main storage. As shown in Figure 6-1, I/O operations result in the transfer of
information between main storage and an I/O ...
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