VSAM I/O Plus

VSAM I/O Plus's architecture centered on optimizing VSAM I/O operations through enhanced buffer management. The main components included a buffer manager, an I/O interceptor, and a performance reporting module. The buffer manager controlled the allocation and deallocation of buffers, optimizing their use to reduce I/O operations.

The I/O interceptor intercepted VSAM I/O requests, allowing the product to optimize them before they reached the storage devices. The performance reporting module collected and analyzed performance data, providing insights into I/O performance and buffer utilization. Communication between components was primarily internal, using z/OS system calls and shared memory.

Configuration was managed through JCL and system utilities, defining parameters such as buffer pool sizes and I/O thresholds. The product did not use any external databases or storage mechanisms beyond the z/OS environment. There were no specific network requirements or open ports.

Security relied on the underlying z/OS security infrastructure, such as RACF. VSAM I/O Plus is no longer supported and has been integrated into Performance Essential. Migrate to Performance Essential for continued VSAM optimization.

This involves updating JCL and configuration files to align with Performance Essential's specifications. Consult the Performance Essential documentation for detailed migration steps.