The monitor supports the MODIFY command with the following options:
Change the filter table (option I).
List the active filter table, the active output data set, the
number of events recorded, the number of lost events, the ENQ delay
of a systems enqueue and the RESMIL value in milliseconds (option
L).
Note: The
monitor measures ENQ delay and RESMIL at the time of the command.
The monitor encounters the same contention for the processor and
storage as does any other address space in the system. Therefore,
even after the system grants the global resource request, the monitor
might not receive control immediately because of processor or storage
contention, and the accuracy of the ENQ delay measurement.
RESMIL
is not displayed if GRS=NONE is specified in IEASYSxx or global resource
serialization is in a star complex.
List the enqueue activities by MAJOR names, RNLs ACTION, if global
resource serialization is active, and the approximate number of global
and local requests (ENQs+DEQs) (option T).
List the RESERVE's activities by volume (option V).
Switch the active output data set (option SW).
List the active RNL's entries (option R). This option offers
a function similar to the MVS™ DISPLAY
GRS,RNL=ALL command.
Stop the monitor (option STOP).
Cancel the monitor if it is a batch job (option C).
To
stop the monitor the MVS P JOBNAME
command can be used along with the MODIFY option STOP.
Figure 2 shows sample output for option
L if global resource serialization is in a ring configuration.
Figure 3 shows sample output for option
L if global resource serialization is in a star complex or GRS=NONE
is specified in IEASYSxx.
You can use the MODIFY option T command to find out the major
names used in the system and to verify the RNLs action.
For a sample output see Figure 4 and Figure 5.
The command MODIFY option T=major lists the minor names used by
the selected major name. For a sample output see Figure 5.
The MODIFY command option V lists the volumes with RESERVE activities.
For a sample output see Figure 6 and Figure 7.
The MODIFY command option V=volser lists the RESERVE requests issued
against the selected volume. For a sample output see Figure 7.
The MODIFY command options T=FREEMAIN and V=FREEMAIN can be used
to reinitialize the dataspace without stopping and restarting the
monitor.
The MODIFY option R command shows the active RNL's entries used.