Learn about IPL (Initial Program Load) in mainframe computing and how it involves loading the operating system from disk into the CPU’s central storage.
Table of Contents
Question
Loading a copy of the operating system from disk into CPU’s central storage is called
A. POR
B. IPL
C. LOADPARM
D. None
Answer
B. IPL
Explanation
IPL, which stands for Initial Program Load, is the correct answer to this question about mainframe computing. IPL refers to the process of loading a copy of the operating system from disk into the CPU’s central storage when a mainframe system is started or restarted.
When an IPL is performed, the mainframe hardware reads a small boot program from a designated section of disk storage. This boot program then loads the larger operating system software, such as z/OS, into central storage. Once loaded, the operating system initializes itself and takes control of the mainframe hardware, allowing it to manage system resources and run applications.
The IPL process is critical for bringing the mainframe online and making it ready for use. It is typically triggered by a system operator or automated operations software.
The other options listed – POR (Power-On Reset), LOADPARM, and “None” – are incorrect in this context. POR refers to the initial hardware reset when power is first applied to the mainframe, before any software is loaded. LOADPARM is a parameter used to pass options to the operating system during the IPL process, but is not the name for the overall process itself.
In summary, IPL (Initial Program Load) is the mainframe terminology for loading the operating system software from disk into central storage during system startup or restart. It is an essential process for readying the mainframe environment to run applications and serve users.
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