What is a VTAM major node?

Rui Miguel Feio — Sat, 04 Sep 2010 17:06:50 +0000

A major node is a list of parameters that define a specific type of network device or group of related devices that VTAM can address.

To define the attachment of any device or set of devices to VTAM, you need to code a major node member in the VTAMLST data set.

Useful VTAM commands

Rui Miguel Feio — Sat, 04 Sep 2010 17:03:16 +0000

1. Display commands

D NET,VTAMOPTS	Display VTAM options, including SUBAREA Number, NETID, SSCPNAME, SSCPID
D NET,BFRUSE	Display information about VTAM¢s virtual storage and buffer pool usage
D NET,APPLS	Display the applications (APPLIDS) that VTAM knows about
D NET,PATHTAB	Display the status of communications PATHs between subareas in the VTAM network
D NET,MAJNODES	Display details about major nodes
D NET,ID=…	Display information about the specified VTAM resource
D NET,ID=…,E	Display more information about the specified VTAM resource

2. Vary commands

V NET,ACT,ID=…	Activate the specified resource
V NET,INACT,ID=…	Deactivate the specified resource
V NET,INACT,ID=…,I	Immediately deactivate the specified resource
V NET,INACT,ID=…,F	Force-deactivate the specified resource
V NET,ACQ,ID=…	Acquire the specified resource (NCP or non-switched PU) without activating it – used during network recovery whereby this VTAM can take ownership of another VTAM¢s resource

3. Modify commands

F NET,TNSTAT,CNSL=YES	Activate the VTAM tuning statistics display and output to the console
F NET,NOTNSTAT	Deactivate the VTAM tuning statistics display
F NET,TRACE,…	Initiate or Modify VTAM tracing
F NET,NOTRACE,…	Terminate VTAM tracing

4. Halt commands

Z NET	Terminate VTAM processing normally
Z NET,QUICK	Terminate VTAM processing immediately without waiting for normal termination of existing sessions – should only be used when normal termination does not complete successfully
Z NET,CANCEL	Abends VTAM – should only be used when both Z NET and Z NET,QUICK are unsuccessful