This workspace provides information about availability and response time for a specific page dataset. Page datasets are auxiliary storage datasets that back up all frames of virtual storage. They must be large enough to contain all common and private virtual storage. Page datasets are used when demand for real storage is greater than the space available and data has been paged out. The process of bringing in data is called a page-in and is coordinated by the auxiliary storage manager (ASM). If swap datasets are not defined, page datasets also contain the swapped out part of an address space.
Because the process of paging is very slow when compared to referencing data from real or expanded storage, it is important that page dataset devices be isolated from contention with other kinds of work. This is especially true if there is contention for real and expanded storage, and the page fault rate is high.
The Percent Full and Response Time bar charts in this workspace provide visual representations of the availability of space in the various types of page datasets and the response times for those datasets.
This workspace can record history.
See also:
Organization
of system-level predefined workspaces
Attribute groups used by system-level predefined workspaces