hb: •• :ss !SG FRO! LOGONxxx: .sgtext
This is the format of a message sent from a user of the V!/370 syste. to
a specified user or to a system operator. This message indicates that
the user has not yet achieved logon status. xxx denotes the real line
address from which the !ESSAGE command was issued. !Qte: For all of the above responses: hh:m.:ss is the time in hours:minutes:seconds wben the message was sent
to the User. If the user receiving the message is the primary syste. operator,
tbe alarm bell at the central computer console rings.
If you are using a 3270, the message puts the screen in a HOLD status
and rings the Audible Alarm, if present. .Press the cancel key to return
to the RONNING status.
section 3. CP Co •• ands 93

MONITOR EVENT TRACING AND RECORDING Use the !ONITOR co.mand to' initiate, override the system generated monitor function, or terminate the recording of events that occur in the
real machine. This recording is always active after a V!/370 IPL (manual or automatic). The events that are recorded in the CP internal
trace table are: • External interruptions • SVC inte£ruptions • Program interruptions • !achine check interruptions • I/O interruptions • Free storage requests • Release of free storage • Entry into scheduler • Queue drop • Bun user requests • Start I/O • Unstack I/O interruptions • Storing a virtual CSi • Test I/O • BaIt device • Unstack IOBLOK or TBQBLOK • KCP BTU (Network Control program Basic Transmission Unit) • Clear Channel operation (CLCH) Use the trace table to determine the events that preceded a CP system failure. Por information on finding and using the internal trace table
see, the PERPOR!ANCE !EASURE!EIT Use the !ONITOB co.mand to: • Display the status of the internal trace table, each implemented
class of data collection, and the specifications for automatic monitoring using spool files. • Enable various classes of !ONITOR CALL. ; • Specify the time intervals for timer-driven data collection. • Start and stop data collection by !ONITOR using tape or spool files. • Override the specifications for automatic monitoring assigned at system generation ti.e. • Close the monitor spool files. I • Specify device addresses to be included in or excluded from a I selection list for DASD seeks analysis.
94 V!/370 Operator's Guide