IBM i > TIPS & TECHNIQUES > SYSTEMS MANAGEMENT

Why Consider Multiple Subsystems?



For example, you may want to have your users doing business-critical work to have a higher run priority than other users. You could accomplish this by having the users doing business-critical work run in a separate subsystem configured with a class that specifies a higher run priority, for example, RUNPTY(15). (Note: A lower run priority number gives a higher priority.)

 

4. Create the subsystem description. To repeat this step for each subsystem, you must define:

CRTSBSD SBSD(SBSLIB/INTER1) POOLS((1 *BASE) (2 *INTERACT)) SGNDSPF(*QDSIGNON)

This creates a subsystem description with attributes identical to those of QINTER.

The storage pools used are specified on the subsystem description. If you want to isolate a set of users to a pool of their own, specify a pool ID with a storage size and activity level specifically for the subsystem, rather than using the shared *INTERACT pool. Optionally, you could define a shared pool with the Change Shared Pool (CHGSHRPOOL) command and specify that shared pool on the subsystem description.

The subsystem description is also where you define the number of jobs you want to run in the subsystem. Options to consider include:

Activity level on the POOLS parameter on the CRTSBSD command—The activity level determines the maximum number of threads that can be actively running in a pool concurrently. More threads than this can be active within the pool, but the activity level determines the number that can be actively running at any time.

Maximum jobs (MAXJOBS) parameter on the CRTSBSD command—The maximum number of jobs determines the number of user jobs running in the subsystem. This value can't be exceeded. Any attempt to start additional jobs when the maximum number of jobs is already running will fail.

Maximum active routing steps (MAXACT) parameter on the Add Routing Entry (ADDRTGE) command—This is the maximum number of jobs that can be active through this routing entry. The default value of *NOMAX is recommended.

Maximum active jobs (MAXACT) parameter on the Add Workstation Entry (ADDWSE) command—This is the maximum number of active jobs that can be active concurrently through the workstation entry. The default value of *NOMAX is recommended.

 

Dawn May is an IBM i consultant. She owns Dawn May Consulting, LLC in the Greater Boston area.


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