.-EXPFLTRM--=--0--------------------. >>-+-----------------------------------+----------------------->< '-EXPFLTRM--=--expedited_flow_count-'
| range: | 0 or 5-255 |
Specifies the number of data flow control (DFC) and session control (SC) request units (RU), that a boundary-attached LU can send without receiving a response from the partner LU. If an LU-LU session exceeds this threshold, VTAM® deactivates the LU-LU session. If the expedited_flow_count defaults to 0 or is coded 0, the function is disabled.
Expedited data flows for an LU-LU session are not governed by the SNA pacing rules. As a result, if a hardware error, or a 3270 emulator logic error occurs, excessive expedited data might flow into VTAM. These unpaced flows may cause excessive resources (storage, CPU cycles) to be consumed to process these requests.
Guideline: Coding a value too small can cause LU-LU sessions to be deactivated. Some environments might need to specify a larger value for EXPFLTRM to avoid unwanted LU-LU session deactivations.
Rule: When an LU-LU session meets or exceeds the defined EXPFLTRM threshold, the session is deactivated and message IST2113I is issued.