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The Multi-User Facility (MUF) is the manager of the system and functionally acts as an operating system for the data. It receives a request from the application and determines how it should be processed. It coordinates the activities that must take place to service the request.
The MUF runs in a separate region in the z/OS environment. The required space for the MUF region varies according to the MUF startup options that are specified using control cards.
The MUF startup options specify the operating environment to CA Datacom/DB. You can change the startup options, but most changes take effect only when the MUF is restarted. Some options can be modified with console commands or by updating some fields in the Dynamic System Tables. Use the options for such things as specifying buffers and information pertaining to the environment and control.
When you specify the options, you provide the resources that CA Datacom/DB uses to operate. Proper specification is the key to optimizing system performance.
CA provides a list of suggested options for each of the products distributed to use CA Datacom/AD. You do not need to make any initial changes to the suggested values in most cases. You can, however, if deemed necessary review the specifications in the sample and make the appropriate adjustments to meet your needs.
In a Shadow MUF environment, a primary (that is, a full read/write) MUF and a Shadow MUF (full, but in sleep mode) work together as a pair to minimize any loss of data access if a failure of the full MUF or some other unplanned outage occurs. Using a Shadow MUF environment also prevents the loss of access to data during planned or unplanned outages.
You can only have one Shadow MUF per primary MUF within the Sysplex.
For more information and resources pertaining to the Shadow facility, see the CA Datacom/DB Database and System Administration Guide.
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