CA Dynam for VSE User Guide

Disk File Maintenance Utilities
Pre-Open Processing—DYNOPEN
The DYNOPEN utility program lets you pre-open a disk data set. It performs
basic CA Dynam/D and Catalog Management services for files that are to be
processed by other utility programs (such as IBM's DITTO or IDCAMS utilities).
It also supports programs that do not issue opens when restarting from
checkpoint.
These other utility programs access the label information and validate the
logical unit assignment of files to be processed before the files are actually
opened. DITTO and IDCAMS require the use of DYNOPEN. Without the use of
DYNOPEN, these types of programs can cancel because CA Dynam/D has not
been invoked to perform its open processing.
DYNOPEN provides the following services:
• Dynamic creation of label information
• Disk pool management
• Automatic Volume Recognition and Assignment (AVR)
DYNOPEN can also be used to resolve labels for the IBM SORT product, SM2.
SM2 performs pre-open checking of volume serial number and extents for
input files, which is not compatible with CA Dynam/D catalog-controlled files,
POOL volume serial numbers, and AVR facilities, unless DYNOPEN is used.
Pre-open processing is performed by a dummy open call to CA Dynam/D.
Therefore, all CA Dynam/D processing is done for a file before the next OPEN
input statement is read.
OPEN Control Statement Syntax
The DYNOPEN program uses only one type of control statement, the OPEN
statement. Apply the following syntax rules to this statement:
• Use free-form format starting in any position in the SYSIPT file.
• Leave at least one space following the OPEN command.
• Separate all operands by either a blank or a comma.
• Exclude any comments from statements.
• Do not continue any statements; positions 72—80 are ignored.
DYNOPEN normally reads input from SYSIPT. When the OPEN function is used
for SYSIPT, DYNOPEN must be directed to read its input from SYSRDR. The
use of UPSI 001 reassigns SYSIPT and causes the DYNOPEN OPEN function to
read its input from SYSRDR instead.
5–8 User Guide