StorageTek 6 manual TAPEREQ Tape Request TAPEREQ Control Statement, TAPEREQ Usage

TAPEREQ

Tape Request (TAPEREQ) Control Statement

The TAPEREQ control statement is used to specify tape request attributes. TAPEREQ statements are read from the definition data set specified by the TREQDEF command. (Refer to “Tape Request Definition (TREQDEF) Command and Control Statement” on page 133 for details on syntax and parameters.) The TAPEREQ statement must be placed in the definition data set; it cannot be issued as an operator command.

To put multiple data sets on multiple volumes, a TAPEREQ statement must be coded for each data set name.

TAPEREQ Usage

As the HSC processes each allocation request, it searches the TAPEREQ statements in the order that they appear in the definition data set to determine the media type, recording technique or model, and subpool parameters to assign to the request. One or more TAPEREQ statements may match the request’s input criteria.

When there are multiple matching TAPEREQ statements containing different parameters, the HSC merges the parameters from the matching statements. Each parameter value is searched for independently, and for each, the first matching TAPEREQ statement is used.

For this reason, StorageTek recommends that you:

•order the TAPEREQ statements from most specific to most general

•specify all applicable parameters on all TAPEREQ statements.

Conflicting parameter assignment can result when multiple TAPEREQ statements are found and their parameters merged. For example, assuming the subpool REDWOOD contains only HELical (Redwood) cartridges, the following TAPEREQs produce inconsistent parameter assignment:

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TAPEREQ JOBNAME(ABC) SUBPOOL(REDWOOD)

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TAPEREQ JOBNAME(**) MEDIA(S)

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These statements cause the HSC to attempt to select a Standard scratch cartridge from a subpool that contains only helical cartridges.

To avoid such scenarios, StorageTek recommends that all applicable parameters be coded on each TAPEREQ and that parameters such as SUBPool not be specified on generic TAPEREQ statements. That is, MEDia and RECtech should be specified on the same TAPEREQ statement as SUBPool.

118VM/HSC 6.0 System Programmer’s Guide

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