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This panel contains settings to allow you to configure the Workload Manager for CICS® Servers and programs.
These settings are applicable only to the Windows® Client daemon.
It is particularly important to understand what is meant by server group. Server groups are used to group together a number of cloned CICS server definitions, and a CICS server can be added to only one server group. For any given server group the Workload Manager will choose just one CICS server definition (at random) to participate in workload management.
Select this check box to enable the Workload Manager. The default is that the Workload Manager is disabled.
Select this radio button to choose a round-robin algorithm for the Workload Manager.
Select this radio button to choose a biased algorithm for the
Workload Manager.
The biasing algorithm is selected by default.
This value specifies the number of seconds after which an invalid
server group can again be included in the list of target server groups.
Enter a value in seconds between 0 and 3600. The default is 60 seconds.
If you enter a value outside the permitted range, the Configuration Tool
warns you. If the value entered is too low, it substitutes the minimum.
If the value entered is too high, it substitutes the maximum. If a
non-numeric value is present in the configuration file, it substitutes
the minimum value.
When a CICS server is selected as the target of a client request, and that server is unavailable, the server is flagged as invalid, and is no longer included in the list of target servers for that server group.
This panel allows you to define which servers belong to a particular server group.
To add a new server group, select the New Server Group option, or click the New Server Group icon, and enter a name in the Server group name field.
To change the members of a server group, select the server group from the tree selection.
Select this check box to enable workload balancing for servers in the selected server group.
If load balancing is enabled for this server group, the first time an instance of the Client daemon makes a request, it selects a server instance from the server group at random. For the duration of the life of the Client daemon instance, all subsequent requests to that server group are sent to the same server instance.
All servers not assigned to a server group are also considered for workload management, and a server not included in a server group is thought to be in a server group of its own. To stop the Workload Manager from sending requests to a server, do the following:
If you disable workload balancing for a particular server group, for any server in that group, the Workload Manager connects only to the server specified in the call; it does not use an algorithm to select the next appropriate server. The Workload Manager does not re-send failed requests to a server that has workload balancing disabled.
This panel allows you to define the workload management for a particular program.
Workload management for particular programs is available only for ECI. If the round-robin algorithm is selected, you define which servers are valid for the program. If the biasing algorithm is selected, you define which servers are used for biasing. When a program defined to the Workload Manager is used, requests are balanced across CICS servers where the program is defined, according to the biasing on this panel.
In the Bias value field, you can enter a bias value for a server. Enter a number between 0 and 100, to represent the ratio of requests sent to that server, compared to other servers. For example, if two servers have a bias of 75 and 25, program requests are sent in a ratio of 3:1 to the first server. If you enter a value outside the permitted range, the Configuration Tool warns you. If the value entered is too low, it substitutes the minimum. If the value entered is too high, it substitutes the maximum. If a non-numeric value is present in the configuration file, it substitutes the minimum value.
In the Ratios fields, percentage bias values for each server are shown. This field contains Standby if the bias value is 0, which means use only if no other server is available.
If you disable workload balancing for a particular program, the Workload Manager connects to the server specified in the call; it does not use an algorithm to select the next appropriate server.
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