MVS

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IPL (Initial Program Load)

16th November 2010 Rui Miguel Feio
z/OS initialization, or an Initial Program Load (IPL), is the act of loading a copy of the operating system from disk into the processor’s real storage and executing it. This process essentially consists of: –    System and storage initialization, including the creation of system component address spaces –    Master scheduler […]
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MVS

How to compress LLA-managed libraries

30th October 2010 Rui Miguel Feio
Sometimes a PDS library needs to be compressed to reclaim the free space caused by member deletions. The recommended procedure for compressing an LLA-managed library is: 1. Create a new CSVLLAxx member that includes a REMOVE statement identifying the library that needs to be compressed (ex: CSVLLA02). REMOVE(SYS1.EXAMPLE.FILE) 2. Then […]
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MVS

The Paging Process

29th October 2010 Rui Miguel Feio
In addition to the DAT hardware and the segment and page tables required for address translation, paging activity involves a number of system components to handle the movement of pages and several additional tables to keep track of the most current version of each page. To understand how paging works, […]
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Glossary

Frames, Pages and Slots

29th October 2010 Rui Miguel Feio
When a program is selected for execution, the system brings it into virtual storage, divides it into pages of 4 kilobytes (4K), and transfers the pages into real storage for execution. To the programmer, the entire program appears to occupy contiguous space in storage at all times. Actually, not all […]