Is service class STCHI or SYSSTC best for SMR or is it not recommended?

Document ID : KB000056666
Last Modified Date : 14/02/2018
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SYSSTC is the "default" service class for started tasks unless you specify

Since SMR spools the log and is continually executing to perform its task, 
the classification should be adequate enough to allow it to function as   
efficiently as possible.                                                 

If you assign STCHI to SMR then this can also work if your logging      
intervals are not agressive. STCHI will keep SMR running properly and not
impact performance unless your system is constantly swapping out higher 
rated workload assigned utilities.                                      

CA documentation says nothing about Workload management settings. But always remain as standardized as you can based on the product purpose and scope as you would any other product that performs the same functions.

Service class STCHI or SYSSTC will usually work properly with no issues. Recommendation is SYSSTC to follow IBM's standards regarding queue related started tasks.