Once an application environment is defined, and there are server address spaces in use by the subsystem, you can use operator commands to manage the application environment. There are options on the VARY WLM,APPLENV or VARY WLM,DYNAPPL command that allow you to quiesce, resume, or refresh application environments. These functions allow you, for example, to make changes to the JCL procedure, start parameters, or application libraries, and ensure that new work requests run with the modified information. The resume function also allows you to recover from error conditions that have caused workload management to stop an application environment.
An action taken for an application environment is saved in the WLM couple data set and is not discarded across an IPL. For example, if a quiesce action is in effect and the system is IPLed, the quiesce action remains in effect. You can query the current state of an application environment using the DISPLAY WLM,APPLENV or DISPLAY WLM,DYNAPPLENV command. The scope of both the VARY and DISPLAY commands for application environments is sysplex-wide, that is, they affect the application environment on all systems in the sysplex, regardless of the scope of the subsystem using the application environment. The sysplex scope of the command ensures that an application environment remains consistent across the sysplex, especially where there are shared resources.
This section first introduces the commands that can be used to perform actions on an application environment. Then it describes activities that make use of the commands and describes other conditions that affect the state of an application environment.