Issuing Data Requests to JES

After an FSA notifies JES (using the FSI SEND request) that it successfully started the associated device, it is ready to begin data set processing. As part of data set processing, the FSA invokes the FSI data access services (GETDS, GETREC, FREEREC, RELDS, and CKPT) to:

Obtain a SYSOUT data set and its characteristics from JES, as described in Getting a SYSOUT Data Set (GETDS)
Obtain logical records of an obtained data set, as described in Getting SYSOUT records from an acquired data set
Release logical records for a data set to JES, as described in Releasing a SYSOUT record
Release an obtained data set to JES, as described in Releasing a SYSOUT data set
Request JES to record checkpoint information for a JES spool data set currently being processed by the FSA device. as described in Requesting a Checkpoint of Processing.

The information provided for each of the FSI data access services on the following pages explain:

The tasks required to invoke the FSI service
The FSI service processing
The information that JES returns in response to the FSIREQ request.

JES groups similar data sets together and prints them between a set of separator pages. A header separator page starts a group and a trailer separator page ends a group. Therefore, when the FSA receives a request from JES to process a data set, the request will include separator page information related to that data set's position within the group.

For example, the first data set in a group will have a header separator page and the last data set in a group will have a trailer separator page. Data sets between the first and the last will not have header or trailer separator pages.