On the Service Coefficient/Service Definition Option panel, you can specify the service definition coefficients, whether you want workload management to manage your I/O priorities, and whether you want workload management to manage your parallel access volume alias addresses.
Defining service coefficients and options provides some advice on how and when to adjust your coefficients.
To find out what service definition coefficients you are currently running with, check your RMF™ Monitor I Workload Activity Report. This report lists the service definition coefficients your installation is currently using.
If you want workload management to manage I/O priorities for you, specify YES for I/O priority management. When you specify YES, workload management manages your I/O priorities and includes I/O usings and delays in its execution velocity calculation. When you specify NO (which is the default), workload management sets the I/O priority to be the same as the dispatching priority, and I/O usings and delays are not included in the execution velocity calculation.
If you want workload management to to
work with I/O priority groups, specify YES to ensure
that work managed by a service class assigned to I/O priority group
HIGH always has a higher I/O priority than work in group NORMAL. This
protection can be valuable for work which is extremely I/O-sensitive.
See Enabling I/O priority groups for more information
on this setting.
If you want workload management to manage parallel access volume alias addresses for you, specify YES for Dynamic alias management. When you specify YES, workload management dynamically reassigns alias addresses from one base to another to help work meet its goals and to minimize IOS queueing. See Specifying dynamic alias management for more information on this global setting and its relationship to the WLMPAV= setting on each individual device. When you specify NO, which is the default, dynamic alias management is globally disabled for the entire sysplex. Systems will still use the aliases assigned to the base devices, but there will be no automatic reassignment of aliases based on goals or queueing.
Figure 1 shows the Service Coefficient/Service Definition Options panel.
Coefficients/Options Notes Options Help
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Service Coefficient/Service Definition Options
Enter or change the Service Coefficients:
CPU . . . . . . . . . . . . . _______ (0.1-99.9)
IOC . . . . . . . . . . . . . _______ (0.0-99.9)
MSO . . . . . . . . . . . . . _______ (0.0000-99.9999)
SRB . . . . . . . . . . . . . _______ (0.0-99.9)
Enter or change the service definition options:
I/O priority management . . . . . . . . NO (Yes or No)
Enable I/O priority groups . . . . . . . NO (Yes or No)
Dynamic alias management . . . . . . . NO (Yes or No)
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