Capacity Plus for VSAM

The architecture of Capacity Plus for VSAM is designed for efficient compression and minimal impact on system performance. The core components include the Compression Engine, the Control Module, and the ISPF interface. The Compression Engine is responsible for the actual data compression and decompression processes.

It utilizes a proprietary compression algorithm derived from PRESSTO technology. The Control Module manages dataset metadata, compression settings, and space allocation. It interacts with the VSAM catalog to track compressed datasets and their associated metadata.

The ISPF interface provides a user-friendly way to configure and monitor the product. It allows administrators to define compression policies, monitor compression ratios, and generate performance reports. The product integrates with z/OS through standard system calls and VSAM I/O operations.

There are no external APIs. Communication between components occurs through internal z/OS mechanisms. Configuration parameters are stored in VSAM datasets and system configuration files.

Monitoring is achieved through SMF records, performance reports, and system logs. The product's design ensures minimal overhead, with compression and decompression operations performed efficiently. The architecture is optimized for VSAM datasets, providing high compression ratios and improved I/O performance.

The product's transparent operation ensures that existing applications continue to function without modification.