StorageTek 6 manual Treqdef

TREQDEF

Tape Request Definition (TREQDEF) Command and Control Statement

The TREQDEF command and control statement is used to specify the definition data set that contains tape request (TAPEREQ) parameter statements. (Refer to “Tape Request (TAPEREQ) Control Statement” on page 118 for details on syntax and parameters.) The data set must be a sequential or a partitioned data set (PDS) with any valid record format (RECFM). Also, the definition data set must contain one or more TAPEREQ statements.

The TREQDEF statement may be specified in the HSC PARMLIB, or it may be issued as an operator command to dynamically load or reload tape request parameters. (Refer to “PARMLIB Control Statements” on page 83 for an explanation of PARMLIB.) If a definition file is changed by a TREQDEF operator command, and if the change is to be permanent, you must update PARMLIB before restarting the HSC.

If the definition file is to be modified for a given shift or application, remember that the new definition remains in effect until another definition is loaded or the HSC is recycled. The definition file then reverts to the PARMLIB specification. Thus, TREQDEF can be used to temporarily change a definition file.

Definition commands issued on one host are in effect only on that host. If different hosts use the same definition data set, then the tape request parameter statements are shared by those hosts.

Notes:

1.When the TREQDEF command is issued, if the definition data set contains errors, an HSC message provides the parameter in error, a description of the problem, and the line number where the error occurred. If the definition data set contains errors, none of the attributes specified in the TAPEREQ control statement(s) will be loaded (put into effect), which may cause data sets to be created on the wrong type of media and incorrect devices to be allocated. Message SLS1627I is displayed if errors are encountered. If 50 errors are encountered, the remainder of the data set is not checked. Correct the problem and reissue the command.

2.The TREQDEF command and control statement executes at both base and full service levels of the HSC.

3.If you issue multiple TREQDEF statements, the last one processed is currently active. You can determine which TREQDEF statement is active by entering the Display TREQDEF command.

Chapter 3. HSC Control Statements and HSC Start Procedure 133

1st ed., 6/30/04 - 312579601