Record type 90 describes changes in SMF and system status. The type 90 record allows the installation to track operator changes (such as the use of the SET SMF or SETSMF command), and with the PROMPT option, to establish availability and reliability statistics for the processor.
If PROMPT (IPLR or ALL) is specified, the system issues a message when an IPL occurs. This message prompts the operator to reply with the time when the failure occurred, the name of the operator, and the reason for the IPL. This information is recorded in a type 90 record.
The installation can set up standard operator replies to the prompt message and then use a post processing program to summarize the reliability data contained in the type 90 record. For example, an operator reply of FTIME=00.00.00 might indicate a scheduled IPL while any other reply indicates a system failure. A standard set of IPL reasons might be provided to the operator, such as scheduled production, processor failure, channel failure, JES failure code xxxx, or scheduled test.
Unless otherwise indicated, the SMFPRMxx parameters apply to both SMF log stream recording and data set recording.