The system analyst may determine, after studying the data
reduction reports, that data collection suspension is occurring because
of insufficient buffer space. The operator may be requested to increase
the buffer allocations using the BUFFS n option of the MONITOR START co.mand until the SYSMON macro in DMKSYS can be revised. Q2ing Data reduction may determine that data collection suspension
is occurring because of insufficient buffer space. This usually occurs
when classes USER and/or DASTAP are enabled, while large numbers of
users are logged on, or the system IIO configuration is extensive. Loss
of data may be avoided by specifying additional buffers (with the BUFFS option of the MONITOR START TAPE command) until no more suspensions are
reported by data reduction. UNRECOVERABLE TAPE ERROR: Unrecoverable tape errors are errors that the j/o error--handlIng-routines cannot recover from by standard recovery
procedures. When an unrecoverable error occurs, MONITeR tries to write
two tape marks and rewind/unload the tape. The use of the tape is
abandoned and data collection stops. The operator is informed or action
taken. Whether or not the write-tape-marks and rewind/unload is
successful, the tape drive is released. £Q!QIIIQ!: When end-of-tape occurs, a tape mark is written
on the tape and it is rewound and unloaded. MOIITOR·is stopped and the
operator is informed of the action taken.
INITIAL PROGRAM LOAD: MONITOR START CPTRACE is active after real systea automatic). The MOlITOR tape data collection is off
after IPL. System shutdown i.plies a MOlITOR STOP TAPE co.mand. The system performs normal com.and processing for the STOP TAPE function. If the VM/370 system fails and data collection is
active, an attempt is made to write two tape marks and rewind/unload the
tape. If the tape drive fails to rewind and unload, be sure to write a
tape mark before rewinding and unloading the tape. MONITOR data
collection is terminated by the system failure. lLQ A supported tape drive must be dedicated to the system for
the duration of the monitoring. The following response occurs if you issue the MOlITOR DISPLAY co.mand and data collection is on tape. If spool files are used, then the
automatic monitoring specifications and status are listed as described
in the MONITOR DISPLAY section. CLS nn
nn KEYWORD keyword
keyword
CPTRACE STATUS ENABLED
DISABLED
ENABLED
Section 3. CP Commands 103

The following response occurs for !ONITOR commands, other than !ONITOR DISPLAY, that successfully execute: CO!!AND CO!PLETE 104 V!/370 Operator's Guide