More than one user can use HCM with the same IODF and configuration file, provided none of the users is updating. HCM initially opens the IODF and configuration file for read-only use, only acquiring update access for each user when required. HCM attempts to acquire exclusive update access when a user wants to update. Only one user is allowed to have access for update. If this fails, the update is refused (that is, someone else is accessing). The session continues in read-only mode.
You may grant certain users access to only the IODF or only the config file, by using the workstation and host security facilities (for example, RACF on z/OS). A user with configuration file access may only update some physical data (for example, configuring fiber management cabinets), but cannot alter the IODF logical data (for example, connecting controllers to processors).
To provide read access for multiple users, you can distribute a production configuration file electronically, or place the file on a central shared disk resource (for example, LAN) for common access.