=SHUTDOWN

Parameters

None.

Operation Notes

The =SHUTDOWN command performs an implicit =LOGOFF of all sessions, including the session logged at the system console. All system processes are stopped in an orderly fashion. This includes the completion of all pending system activity and any processing necessary to ensure that the integrity of all system tables and directories is maintained. Once these procedures are complete, SHUT is displayed on the console, the CPU halts, and console interrupt (CTRL A) is ineffective.

Device configuration changes that were made after the preceding load (UP, DOWN, ACCEPT, REFUSE, and spooling commands) are not retained. Configuration changes made during a system startup from tape are recorded and retained until the next system startup from tape. Newly assigned or released global resource identification numbers (RINs) are permanently recorded.

All communication lines must be closed before issuing a =SHUTDOWN command or a manual halt of the system may be necessary. Note that data is lost if a transmission is in progress when the halt is performed. If any network service (NS) lines are left open when the =SHUTDOWN command is issued, lines to the remote system remain open and any remote sessions become hung. In this case, the remote system's operator may need to issue ABORTIO commands for the hung sessions and then abort the sessions themselves.

Spooled devices stop operation immediately upon receiving a =SHUTDOWN command. A START RECOVERY retains spoolfiles which are printed when the system is returned online.

You can use any of the options to indicate the reason that you are shutting down the system. These options were developed to identify any possible type of system hang that might occur. For example, if you shutdown to clear a DTC hang, you can use the =SHUTDOWN dtc option.

Use

This command may be issued only at the physical console.

Example

To shut the system down, first issue a warning to all users to allow them time to log off, and then execute =SHUTDOWN as shown below:

  WARN @;SYSTEM WILL SHUTDOWN IN FIVE MINUTES. PLS LOG OFF.
 
  CTRL A     
  =SHUTDOWN
  10:49/#S40/25/LOGOFF
  10:49/20/ALL JOBS LOGGED-OFF

To shut down the system in order to identify a DTC hang, use the dtc option. The console responds by listing shutdown messages similar to these:

   CTRL A
  =SHUTDOWN dtc
 
  Shutdown of operating system begins. (Shut 1)
  Shutdown of user processes begins. (Shut 2)
  Shutdown of jobs & sessions begins. (Shut 3)
  Spoolers notified of a shutdown. (Shut 16)
  Shutdown of system processes begins. (Shut 4) 
  Shutdown of system managers begins. (Shut 5)
  Shutdown of operating system complete. (Shut 6)