Lock monitoring with the coupling facility structure activity report

The Coupling Facility Activity Report of z/OS® Resource Measurement Facility (RMF) describes activity to all structures in the coupling facility for a given time period.

The following figure shows a partial report, giving information about:

A : Total number of lock-related requests.
B : Number of requests that were deferred because of contention.
C : The number of deferred requests that were caused by false contention.

Figure 1. Partial RMF Coupling Facility Activity report for lock structure

                                      COUPLING FACILITY STRUCTURE ACTIVITY

STRUCTURE NAME = DSNDB0A_LOCK1      TYPE = LOCK
          #REQ    --------------    REQUESTS ------------  ------ DELAYED REQUESTS -----------
SYSTEM    TOTAL           #     % OF -SERV TIME(MIC)- REASON  #  % OF  ---AVG TIME(MIC)---   EXTERNAL REQUEST
NAME      AVG/SEC        REQ    ALL      AVG  STD_DEV        REQ  REQ   /DEL   STD_DEV /ALL  CONTENTIONS
STLABC2    126K  SYNC   126K   51.0%     61.0   22.5                                         REQ TOTAL 162K  A 
          701.7  ASYNC   0     0.0%       0.0    0.0   NO SCH 0   0.0%   0.0   0.0   0.0     REQ Deferred 612
                 CHNGD   0     0.0%  INCLUDED IN ASYNC                                       -CONT     621   B 
                                                                                             -FALSE CONT212  C