CA Dynam for VSE User Guide

Basic Components
The enhanced VTOC management facility improves upon VSE VTOC
management in the following areas:
• Rotational position sensing (RPS) is used on CKD devices, reducing
channel busy time.
• Software position maintenance is used on FBA devices to eliminate
redundant VTOC I/O.
• VTOC indexes can be built on DASD volumes as desired. These indexes are
used to even further reduce VTOC I/O and channel busy time.
CA Dynam/D requires no modifications to the supervisor or its components. Its
front-end processors are invoked before calling the unmodified IBM
OPEN/CLOSE transient programs.
Basic Components
To effectively use CA Dynam/D, you must understand the following basic
components of the system:
• Disk space allocation
• Catalog management
• VTOC management
These components form the nucleus of CA Dynam/D and direct you to other
facilities available in the system. For example, if you want CA Dynam/D to
control disk file management and to distribute the allocation of disk space
across several disk volumes, utilize disk pool management.
Details for using the CA Dynam/D system effectively are supplied in this
chapter.
Allocate Disk Space
This section describes how to allocate disk space using CA Dynam/D.
Primary Disk Space
CA Dynam/D is designed to control and allocate disk space for the VSE user.
The user can request space to be allocated by CA Dynam/D in one of two
ways, depending on whether a file is defined in the CA Dynam Catalog.
4–2 User Guide