In order to control your MAS environment, you must know its present status and settings. You can issue the $D MASDEF command to display the characteristics of the MAS configuration. The $HASP843 message displays information including the time limits on maintaining control of the checkpoint data set, and whether a member can reset the checkpoint data set automatically.

The $D MASDEF command also provides a means of determining what member owns the checkpoint data set lock, and if a member is actively updating the checkpoint data set. The RSVHELD parameter displays the member that has access to the checkpoint data set, but is not actively updating the data set; the QUESHELD parameter displays the member that has access to the checkpoint data set, and is actively updating the data set.

Use the $D MEMBER command to list the status of the members in the MAS configuration. The $HASP673 message displays information including the member name, the MVS™ system name, and the status of each member.

You can use the $D command at any time during processing to display the current settings of JES2 initialization statement parameters. If you specify only the statement name, JES2 will display all of the parameters defined on that statement. If you want to display only certain parameters, you must specify the statement name followed by the parameters requested, separated by commas. Because the $D command allows you to examine the controls in effect, it is recommended that you use this command before making any modifications with the $T command.

You can route the output of certain $D commands to an alternate area and/or console. The $ADD REDIRECT command allows you to specify on which consoles such output can be displayed. For a list of the supported parameters for this command, see the description of the $ADD REDIRECT command. The $D REDIRECT command allows you to display the redirection that is already in effect on the member. For a list of the supported parameters for this command, see the description of the $D REDIRECT command. You can alter the REDIRECT initialization statement and specify different consoles for output by issuing the $T REDIRECT command. For a list of the supported parameters for this command, see the description of the $T REDIRECT command. z/OS JES2 Initialization and Tuning Reference, SA32-0992 contains a complete description of the REDIRECT initialization statement.