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44 VM/HSC 6.0 System Programmer’s Guide
1st ed., 6/30/04 - 312579601
Scratch Subpool Management
Management of scratch subpools within the library is an important function affecting
library performance and your ability to have greater control over scratch volume activity.
You can effectively manage your scratch subpools by several available means. These
include:
• Defining subpool information in a PARMLIB control statement — Scratch
subpools can be defined using the Scratch Subpool (SCRPOol) PARMLIB control
statement.
SCRPOol permits you to enter the following information for each subpool:
- a subpool name
- the range of volume serial numbers
- the label type
- the HOSTID.
• Enabling scratch subpools — Scratch subpools specified by SCRPOol are defined
in the SLSSYSxx command list and are executed when the HSC is initialized. Refer
to “Scratch Subpool Control Statement” on page 80 for detailed information on how
to implement scratch subpooling using the SCRPOol control statement. (The syntax
for the SCRPOol PARMLIB control statement is also shown in Appendix A,
“Macros, Control Statements, Utilities, and Commands Syntax Reference” on page
387)
• Defining subpool information using the TMI — Refer to the HSC Interface to
Tape Management Systems Manual for more information.
• Specifying scratch subpool parameters with operator commands — Several
commands are available for controlling scratch subpools. Complementing these
commands are scratch subpool parameters in two utilities. The syntax for each
operator command is contained in Appendix A, “Macros, Control Statements,
Utilities, and Commands Syntax Reference” on page 387.
The commands that can be used to display scratch subpool information include:
- Display SCRatch and Display THREShold commands
- Warn command.
Commands that include scratch subpool parameters are:
- EJect
-ENter
- Mount.
Utilities that include scratch subpool parameters are:
- Scratch Redistribution (SCREdist) control statement
- ENTEr utility
- EJECt utility.