VAXcluster Software, Version 5.1

VAXcluster Software provides a highly integrated VMS computing environment that distributes resources across multiple VAX and MicroVAX systems. It allows cluster members to share resources like disk and tape storage, CPU, and system management operations while maintaining individual system independence. Key features include coordinated access to shared resources for data integrity, high availability through failover, clusterwide batch and print queues with load balancing, automated configuration, and dynamic cluster status monitoring.

The software supports three main configurations: CI-based (Computer Interconnect), Ethernet-based (Local Area VAXcluster), and mixed-interconnect. Specific rules apply to each configuration regarding maximum CPUs, interconnect types, and node roles. Specialized nodes include "satellite nodes" (Ethernet-only, down-line loaded by boot servers), "disk servers" (VAX systems making disks available via HSCs or MSCP server software), and "boot servers" (disk servers that down-line load satellites).

Hardware requirements vary but generally include a minimum of 4 MB of memory per VAXcluster member and specific Ethernet (e.g., DESVA, DEQNA) or CI (e.g., CIBCI, CI750) adapters. Boot servers require a minimum of an RF30 system disk. CI-based and mixed-interconnect clusters can leverage HSC50/HSC70 intelligent mass storage controllers for improved I/O, multiple host access, and volume shadowing, with a Star Coupler Expander (CISCE) available to increase CI-connected node counts.

Software requirements primarily specify VMS Operating System V5.1 and DECnet-VAX V5.1 (End Node or Full Function license) for cluster communication and utilities. Optional software includes VAX Volume Shadowing, VAX Performance Advisor, and VAXcluster Console System, which enhance functionality and manageability. Licensing for VAXcluster Software is required per CPU, allocated on a CPU-capacity basis, and supported by the VMS License Management Facility.