Why are some files allocated with BLKSIZE=32000?

Products

• Datacom
• DATACOM - AD
• CIS
• COMMON SERVICES FOR Z/OS
• 90S SERVICES
• DATABASE MANAGEMENT SOLUTIONS FOR DB2 FOR Z/OS
• COMMON PRODUCT SERVICES COMPONENT
• Common Services
• CA ECOMETER SERVER COMPONENT FOC
• Easytrieve Report Generator for Common Services
• INFOCAI MAINTENANCE
• IPC
• UNICENTER JCLCHECK COMMON COMPONENT
• Mainframe VM Product Manager
• CHORUS SOFTWARE MANAGER
• CA ON DEMAND PORTAL
• CA Service Desk Manager - Unified Self Service
• PAM CLIENT FOR LINUX ON MAINFRAME
• MAINFRAME CONNECTOR FOR LINUX ON MAINFRAME
• GRAPHICAL MANAGEMENT INTERFACE
• WEB ADMINISTRATOR FOR TOP SECRET
• Xpertware

Issue/Introduction

In the installation JCL some files like the AABDDATV and CABDDATV libraries are allocated with a blocksize of 32,000. 
Considering the capacity of a 3390 track is 56,664 this is wasting a lot of DASD space.
Is there some restriction that prevents these files from having a more efficient block size?

Environment

Release: DBCISF00200-15.1-Datacom-Database-Option for CICS Services
Component:

Resolution

The block size for the AABDDATV and CABDDATV libraries do not need to be 32,000.
All future PAX files for CA Datacom products will be changed to use half-track blocking, 27,998.
You can change the install JCL to use BLKSIZE=27998.