NACPROBE start option

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   .-NACPROBE--=--NODUMP----------------.   
>>-+------------------------------------+----------------------><
   '-NACPROBE--=--+-NODUMP------------+-'   
                  +-DUMP--------------+     
                  '-Number_of_minutes-'     

Specifies whether VTAM® takes an FFST™ probe dump when VTAM does not complete the CLOSE ACB processing for an application in a timely manner. The title of the dump is "NACCT -- CLOSE TIMER EXPIRED FOR applname". Alternatively, you can use this option to specify the time interval at which VTAM takes an FFST probe dump when VTAM does not complete the CLOSE ACB processing for another application in a timely manner.

VTAM must complete the CLOSE ACB processing in a timely manner; otherwise, VTAM takes an FFST probe dump to notify the user and forces the CLOSE ACB processing to complete.

Issue the MODIFY VTAMOPTS command to change the NACPROBE value when VTAM is running. The MODIFY VTAMOPTS command changes the value immediately.

Issue the DISPLAY VTAMOPTS command to display the NACPROBE value.

NACPROBE=NODUMP
Specifies that VTAM does not take an FFST probe dump when VTAM does not complete the CLOSE ACB processing for an application in a timely manner.
NACPROBE=DUMP
Specifies that VTAM takes an FFST probe dump when VTAM does not complete the CLOSE ACB processing for an application in a timely manner. If the CLOSE ACB processing for another application does not complete in a timely manner, VTAM does not take another FFST probe dump if the previous FFST probe dump was taken less than 30 minutes ago.
NACPROBE=Number_of_minutes
Specifies that VTAM takes an FFST probe dump when VTAM does not complete the CLOSE ACB processing for an application in a timely manner only if the interval specified by the Number_of_minutes value has been exceeded since a previous FFST probe dump was taken for another application.

Valid values for Number_of_minutes are in the range 1 - 1440 minutes (1440 minutes specifies 1 day).

Note: If VTAM does not take an FFST probe dump because of the NACPROBE start option value, VTAM forces the CLOSE ACB processing to complete and issues the following message:
              IST2364I CLOSE ACB TIMER EXPIRED FOR applname