In addition to the resource control facilities provided by FEPI, you can
use specific VTAM® commands to manage communication with target systems. They are particularly
useful where there are problems in acquiring or releasing sessions; see ACQSTATUS.
These commands are fully described in the VTAM Operations manual, but are summarized here. You can:
- Use the VTAM DISPLAY command to inquire about the status of the FEPI nodes (acting as SLUs) and the target
systems. It should normally be necessary to use this command only when you
experience problems in communicating with a particular target. Note that to
understand the displays you require some knowledge of how VTAM operates. VTAM
messages are explained in the VTAM Messages and Codes manual.
- Use the VTAM VARY command to control the availability of resources within the network. In the case of FEPI,
you can use it to force the closure of a node regardless of whether it is
being used in an active conversation. This is achieved by making the VTAM
node inactive. However, any pending request to change to a state of RELEASED
or OUTSERVICE is able to complete. A subsequent VARY ACTIVE command makes
the node available for use again (if its state is still INSERVICE).
- Use the VTAM VARY TERM command to terminate
individual connections--that is, to end the session between a particular
PLU (target) and SLU (FEPI) pair.
- Use the VTAM DISPLAY SESSIONS command to diagnose problems in establishing sessions. To use this command, you
require an understanding of VTAM session processing.
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