Modifying tuning statistics

You can perform the following tasks to modify tuning statistics:

To initiate recording of tuning statistics, use the TNSTAT start option or issue the MODIFY TNSTAT operator command.
To stop or start the recording of tuning statistics, or to adjust the tuning statistics controls at any time, issue the MODIFY NOTNSTAT or MODIFY TNSTAT command.
To initiate recording for all devices (global TNSTATs), specify the VTAM® TNSTAT start option.
To initiate global TNSTATs, issue the MODIFY TNSTAT command with the ACTION=ACTIVATE operand (or allow it to have default settings) and without the TRLE operand.
To stop global TNSTATs, issue the MODIFY NOTNSTAT command without the TRLE operand.
To determine which devices are recording or what the tuning statistics controls are set to, issue the DISPLAY TNSTAT command.
If you do not want to modify recording on all devices, specify the TRLE operand on both MODIFY commands to initiate and stop recording on a TRLE basis.
By specifying the TRLE operand, recording is modified for only those devices managed by the TRLEs that you specify. If you do not specify the TRLE operand, all devices are modified.

The CNSL and TIME values apply to all devices that are actively recording. These values are unaffected by the presence or lack of the TRLE operand.

Summary records can be written to SMF and the system console. If SMF is available, records are written to SMF. If the CNSL TNSTAT parameter is set to YES, summary records are sent to the system console.