Individual systems connected via shared DASD

Individual systems connected through shared DASD shows three z/OS systems connected via shared DASD.

System A is the HCL Workload Automation for Z controlling system. Systems B and C are controlled systems, each of which shares a submit/release data set with the controlling system. Each of the three systems is represented by a computer workstation. The destination field in the workstation description for System A is left blank, indicating that HCL Workload Automation for Z should submit work to the system that the controller is started on. The destination field in the workstation descriptions for Systems B and C contains the DD name of the submit/release data set connecting them to the controller. Work is sent to the correct submit/release data set and is then passed to the corresponding system for processing by the event writer on that system.

Figure 1. Individual systems connected through shared DASD

eqqi10ab The graphic shows individual systems connected via shared DASD.

The event writer subtask on each system writes event information to its event data set. Three event-reader subtasks, one for each of the event data sets, are started in the controller on System A. The controller reads the event data sets and updates the current plan.

Automatic workload restart can be invoked in this configuration if an I/O error occurs when the controller attempts to open a submit/release data set. The workstation that has this submit/release data set as a destination is given the offline status, and WLR actions are taken according to the options specified on the WSOFFLINE keyword of the JTOPTS initialization statement.

Example EQQPARM members for the previous figure shows the initialization statements you can use to create the configuration in Individual systems connected through shared DASD.

Table 1. Example EQQPARM members for the previous figure

EQQPARM members for System A
CONTROLR 
OPCOPTS  OPCHOST(YES)
         ERDRTASK(3)
         ERDRPARM(ERDRA,ERDRB,
         ERDRC)
ROUTOPTS DASD(SUDSB,SUDSC)
TRACKERA 
OPCOPTS OPCHOST(NO)
        ERDRTASK(0)
        EWTRTASK(YES)
        EWTRPARM(TRKAEW)
TRROPTS HOSTCON(DASD)
ERDRA 
ERDROPTS ERSEQNO(1)
TRKAEW 
EWTROPTS
ERDRB 
ERDROPTS ERSEQNO(2)
ERDRC 
ERDROPTS ERSEQNO(3)

EQQPARM members for System B
TRACKERB 
OPCOPTS OPCHOST(NO)
        ERDRTASK(0)
        EWTRTASK(YES)
        EWTRPARM(TRKBEW)
TRROPTS HOSTCON(DASD)
TRKBEW 
EWTROPTS SUREL(YES)

EQQPARM members for System C
TRACKERC 
OPCOPTS OPCHOST(NO)
        ERDRTASK(0)
        EWTRTASK(YES)
        EWTRPARM(TRKCEW)
TRROPTS HOSTCON(DASD)
TRKCEW 
EWTROPTS SUREL(YES)
Note: In this example, SUDSB and SUDSC are used for the user-defined DD names of the submit/release data sets. Both of these DD names appear in the JCL procedure of the controller. They also appear in the destination field of the respective workstations.