Migrating an Environment from OpenVMS VAX to OpenVMS Alpha

This manual, published in December 1995, provides guidance for system managers and software engineers on migrating computing environments from OpenVMS VAX systems to OpenVMS Alpha systems or mixed-architecture VMSclusters.

The document details:

• Similarities and Differences: It compares VAX and Alpha environments across user interfaces, system management, and programming, noting that while core utilities and the DCL command language remain largely the same, architectural changes (such as RISC technology, larger page sizes, and specific system management differences) require adjustments during migration.
• System Management: It covers setup, maintenance, security, performance optimization, and network management, providing specific tables to compare OpenVMS VAX and OpenVMS Alpha implementations. Key differences highlighted include system parameter tuning, memory management (page vs. pagelet units), and I/O subsystem configuration.
• Performance Optimization: It details techniques for Alpha-specific performance tuning, such as the use of granularity hint regions (GHRs) and the virtual I/O cache.
• Interoperability: It addresses how VAX and Alpha systems can coexist within a VMScluster, covering networking, booting, upgrades, and managing applications in a mixed-architecture environment.
• Migration Support: The manual outlines services and training provided by Digital Equipment Corporation to assist in the migration process.