The configuration for z/Server is now part of the Mainframe Access Server XML configuration file and is used to store all of the configuration and properties that control how Mainframe Access Server and the z/Server feature operates. It's these parameters that you need to review before you can get your z/Server feature setup.
In order to take advantage of the new single Mainframe Access XML configuration file you must have taken all the actions in the Migration to use the XML configuration file, be using the unified scheduler and using MFA Server to start the holder task internally (equivalent to having set ZSERVER FEATURE=HOLDER in the old MFA Server configuration file). These migration actions can be found in the Micro Focus Enterprise Developer 3.0 product Help.
See Migrating old configurations to new XML configuration for more information on how to migrate your existing configuration files.
Legacy configuration files are still supported. If you want to continue to use them, full details of their use are contained in the version of the z/Server Installation Guide that accompanied Enterprise Developer for z Systems 3.0, available from the Micro Focus Product Documentation web pages.