Manage subsystems

Because jobs run in subsystems, you might need to monitor subsystem activity for potential problems that can affect a job's ability to run.

The subsystem is the work place for jobs on the iSeries™ server. All user work is done by jobs running in the subsystem and it is important to monitor this area for slow work performance. In iSeries Navigator, you can view jobs and job queues associated with the subsystems. Also, you have the same functionality with jobs and job queues from any other area that displays jobs and job queues.

• Common subsystem tasks
  This information discuss the most common tasks that you can perform on a subsystem.
• Create a subsystem description
  You can create a subsystem description in two ways. You can copy an existing subsystem description and change it, or you can create an entirely new description.
• Change a subsystem description
  The Change Subsystem Description (CHGSBSD) command changes the operational attributes of the specified subsystem description. You can change the subsystem description while the subsystem is active. To change a subsystem description, use the character based interface.
• Delete a subsystem description
  The Delete Subsystem Description (DLTSBSD) command deletes the specified subsystem descriptions (including any work entries or routing entries added to them) from the system. Job queues assigned to this subsystem by the Add Job Queue Entry (ADDJOBQE) command are not deleted. In fact, when you delete a subsystem description (SBSD), none of the objects that are referenced by the SBSD are deleted.
• Configure an interactive subsystem
  The information in this section explains how to set up a new interactive subsystem.
• Create a controlling subsystem
  IBM^® supplies two complete controlling subsystem configurations: QBASE (the default controlling subsystem), and QCTL. Only one controlling subsystem can be active on the system at one time. Typically, the IBM^® supplied subsystem configurations should be sufficient for most business needs. However, you can create your own version of a controlling subsystem and configure it to more closely meet your company's unique needs.
• Place the system in restricted state
  If all of the subsystems, including the controlling subsystem are ended, the system goes into a restricted condition. You can place the system in a restricted condition by using one of two commands from an interactive workstation.