Technical Information › SVC Analysis

SVC Analysis

A supervisor call (SVC) is a System/370 machine instruction that temporarily transfers control to the operating system to perform a system service, such as allocating a data set. SVCs run in supervisor state and can issue privileged instructions. They can gain access to all main storage of the computer. z/OS provides many SVCs. In addition, a data center can add its own SVCs to provide additional functions.

The SVC Analysis function shows you the number of SVCs, their names, who supplied the SVC, and where SVCs reside in storage. Different versions of z/OS can include different SVCs. CA Auditor always displays the SVCs that are actually in use on the system.

CA Auditor displays four SVC Analysis panels:

• IBM SVC Analysis displays standard primary IBM SVCs. These SVCs have SVC numbers in the range of zero (0) to 199
• User SVC Analysis displays SVCs with numbers in the range of 200 to 250
• ESR SVC Analysis for Extended SVC Router SVCs
• SVCUPDTE Journal Analysis

To analyse the SVC

1. From the Primary Menu, select option 3.

   The z/OS Technical Information screen is displayed.

2. Select option 7.

   The SVC Analysis submenu is displayed.

3. Enter the number of the option that you want to use.

   For each SVC displayed on the analysis display, CA Auditor performs a series of evaluations to identify unusual module structures or relationships. When CA Auditor detects an unusual condition, it places an asterisk (*) in the review recommendation field of the corresponding SVC.

4. To review the SVC, enter S next to the SVC

   The Detailed SVC Information screen is displayed. CA Auditor gets the information displayed on this panel from the SVC table and IBM documentation.