CA Dynam for VSE User Guide

Controlling Disk Pools
To catalog an ISAM file:
// JOB CATALOG ISAM FILE
// DLBL ISMOUT,'ISAM.FILE (C,I)',12,ISC
// EXTENT SYS001,POOL01,4,1,1,3
// EXTENT SYS001,POOL01,2,2,1,4
// EXTENT SYS001,POOL01,1,3,1,19
// EXEC PROGRAM
CADD002I ALLOCATED FILE=ISMOUT SYS001=202 SYSWK2 X=1/14/3
CADD002I ALLOCATED FILE=ISMOUT SYS001=202 SYSWK2 X=2/160/4
CADD002I ALLOCATED FILE=ISMOUT SYS001=202 SYSWK2 X=3/171/19
Controlling Disk Pools
Two facilities are provided for controlling allocation and access to DASD
devices by CA Dynam/D: the COMPOOL option record, and the COMAVR option
record.
Defining Disk Pool Volumes (COMPOOL)
Disk pool management is a feature which lets you select a volume from a
group or pool of disk volume serial numbers. Defining a pool of disk volumes
provides a better balance of disk volume usage, thereby increasing efficiency.
In addition, you can specify different disk pools for each partition defined in
the operating system.
You can also define protected areas on a disk pool volume, thus ensuring that
these areas are never used by CA Dynam/D for disk space allocation. While CA
Dynam/D will not allocate in these areas, the files therein are still scanned
during mapping, and can be deleted if found to be expired.
When defining a pool of disk volumes, you must specify the following:
• A virtual volume serial number which does not exist as a physical DASD
volume
• A group of real or existing volume serial numbers which are related to the
virtual serial number
Make certain that the virtual serial number you specify matches the VOLSER
number entered either in an EXTENT statement or in the CA Dynam Catalog.
4–30 User Guide