MicroVAX Dual-Host Systems

This document, "MicroVAX Dual-Host Systems" (Order Number EK-338AC-DH-003) by Digital Equipment Corporation, serves as a planning guide for configuring dual-host MicroVAX systems.

It describes how two Q-bus MicroVAX systems (or a MicroVAX and a VAX 4000 Model 300) can be connected via a Digital Storage Systems Interconnect (DSSI) bus to share Integrated Storage Elements (ISEs) and other resources. The primary purpose of such configurations is to minimize downtime and enhance data and system availability through features like automatic failover, shared disk storage, and shared resources for VAXcluster environments.

Key components detailed include RF-series ISEs, storage expanders, DSSI cables, and DSSI adapters (Embedded DSSI Adapter (EDA) or KFQSA modules). Software requirements specify VAX/VMS version 5.3-2 or later, along with DECnet and VAXcluster software. The manual outlines configuration rules, supported adapters, and VMS version compatibility, concluding with diagrams illustrating various supported dual-host configurations.