Management Information › System Overview

System Overview

The z/OS System Overview provides a comprehensive overview of the operating system and environment. The information that you see on this display includes the CPU model and serial number, the release number of z/OS that the data center is using, the time and date of the last initial program load (IPL), and the amount of common service area (CSA) in use.

Use the CPU model and serial number to verify billing information. Unscheduled IPLs can indicate serious system problems. And monitoring both CSA and private area sizes and use can be helpful in performance tuning. As the CSA area increases in size, the private area will correspondingly decrease and, while this usually presents no major problems, it can have an impact on certain applications with specific private area storage requirements, particularly for below-the-line storage.

The z/Architecture indicator identifies whether the current operating system is running in ESA/390 mode, or 31-bit addressing, or whether it is running in z/Architecture mode (64-bit addressing). Normally this should have no affect whatsoever on any application or system functions, but there may be certain advanced functions of program products and/or applications which may be dependent on z/Architecture mode.

To overview the system

1. Select option 1 from the Primary menu.

   The Management Information menu is displayed.

2. Select option 1.

   The z/OS System Overview displays the operating system release number that the data center is using, the time and date of the last IPL, and the amount of common service area (CSA) in use. Also displayed is information relating to how the current IPL was performed, the available size of the private area, the JES2 node name (if defined), and the current z/Architecture level set indicator.