System Paging Activity attributes

The System Paging Activity attribute group provides information about factors taking place in your z/OS system that affect system paging rates, including the paging rate, page fault rate, and number of I/O requests waiting for processing.

ASM Queue Length The number of I/O requests waiting to be processed by the Auxiliary Storage Manager (ASM). Valid value is a 4-byte integer.

Datasets Not Operational The number of page datasets that are not operational. This condition can occur if there are a number of I/O errors to the device or the device has not responded to an I/O request. Valid value is a 4-byte integer.

Expanded Storage Pages Moved The total number of pages moved per second to and from expanded storage. Valid value is a 4-byte integer having one decimal position.

Managed System The z/OS operating system in your enterprise that is being monitoring. Valid value is a character string with a maximum length of 32 bytes.

Page Fault Rate The number of page faults per second. A page fault is an interrupt that occurs when an executing program references an address that is not in central storage. Valid value is a 4-byte integer.

System Page Rate The rate at which paging occurs over all storage areas (common, private, and system). Valid value is a 4-byte integer having one decimal position.

Unreferenced Interval Count Represents the time in seconds for a complete steal cycle. A complete steal cycle is the time the stealing routine needs to check all frames in the system. When there is a demand for storage, the stealing routine tests the reference bit of a frame, decides whether to steal the frame, and schedules the page-out. Valid value is a 4-byte integer.