Understanding z/OS Virtual Storage

Although the same in concept, memory, or virtual storage, has very different features in z/OS systems than in other systems. An understanding of the nature of virtual memory in z/OS is a basic requirement for a real understanding of how mainframe systems work. From its beginnings in the 1970's, virtual memory in z/OS has evolved into a complex web of acronyms, control blocks, and functions.

In this webinar we discuss the unique memory addressing scheme used in z/OS (24, 31, and 64-bit), the complex layout of z/OS storage (PSA, SQA, private and common storage, and extensions), and the means of allocating, fixing, using, and releasing virtual storage (GETMAIN, FREEMAIN, and more). We also discuss some of the peculiarities of z/OS storage, such as data spaces and subpools, all with the aim of gaining a greater understanding of the importance of virtual storage and its use in the z/OS operating system and applications.

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