SF72 Storage Array Owner's Manual

This document is the Owner's Manual for the SF72 Storage Enclosure and SF200 Storage Array, published by Digital Equipment Corporation in January 1991.

It serves as a guide for users to safely and effectively operate these storage devices. The manual covers:

1. Introduction:

   • SF200 Storage Array: A rack cabinet designed to hold SF72 storage enclosures and magazine tape subsystems. It connects to host systems via Digital Storage System Interconnect (DSSI) buses and supports both single-host and dual-host configurations. Detailed specifications and environmental requirements are provided.
   • SF72 Storage Enclosure: A unit that can be installed in the SF200 array or other system cabinets. It houses either two (SF72-HK) or four (SF72-JK) RF72 disk Integrated Storage Elements (ISEs), each independently controlled by the SF72 Operator Control Panel (OCP).

2. SF200 Storage Array Site Preparation:

   • Outlines environmental conditions (Class A computer room), power requirements (3-phase AC), space considerations for access and airflow, and floor loading capacity.
   • Emphasizes the need for correct system configuration sheets and adequate KFMSA modules in the host system.

3. SF72 Storage Enclosure Operation:

   • Configurations: Explains how SF72 enclosures can operate in two modes:
     • Through-Bus Mode: All disk ISEs connect to a single DSSI bus, terminated externally.
     • Split-Bus Mode: Disk ISEs on the left and right sides connect to different DSSI buses, which are internally terminated by a Transition Termination Module (TTM) (used in single-host configurations only).
   • Controls and Indicators: Details the functions of the front panel OCP (including Ready, Write Protect, Fault buttons/indicators, DSSI ID display, MSCP enable switch, and drive DC power switches) and the rear panel (DSSI connectors, AC power switch, line voltage selector, and power supply fault indicator).
   • Operational Procedures: Provides step-by-step instructions for applying power to the enclosure, bringing disk ISEs online, and taking them offline.

4. Troubleshooting:

   • Offers basic procedures for verifying hardware problems before contacting Digital Customer Services.
   • Describes how to recover from a disk ISE fault condition, including how to display and clear fault codes from the OCP.

The document includes figures and tables to illustrate configurations, specifications, and control functions. It also provides a glossary of technical terms used throughout the manual.