RF Series Integrated Storage Element User Guide

This user guide, published in April 1993 by Digital Equipment Corporation, provides comprehensive information for the RF Series Integrated Storage Elements (ISEs).

The RF Series ISEs (RF31/31F, RF35/31T, RF36, RF72, RF73, RF74) are disk storage devices utilizing Digital Storage Architecture (DSA) and the DSSI bus. Each ISE contains an embedded intelligent controller and an on-board MSCP server, allowing for independent operation and efficient, multiplexed data transfers. Key performance features include multihost support, optimized seek ordering, request fragmentation, quadruplicated headers, 264-bit Error Correction Code (ECC), controller-initiated bad block replacement, and both Replacement Control Table (RCT) and read-ahead caching. Detailed specifications regarding storage capacity, access times, power consumption, media characteristics, and environmental conditions are provided for each model.

The document explains the theory of operation, detailing the physical components such as the Head-Disk Assembly (HDA) and the drive module (printed circuit board). It describes the functional areas of the drive module (e.g., microprocessor, DSSI interface, buffer RAM, spindle, actuator, read/write circuitry) and illustrates the data and command flow, highlighting error detection and correction mechanisms. The firmware structure, including a mini-operating system and various servers like the MSCP and Diagnostic and Utility Protocol (DUP) servers, is also covered.

It describes controls and indicators located on system enclosure Operator Control Panels (OCPs) and the ISE drive modules, explaining how to set DSSI node IDs and configure write-protection. The guide also details various local programs (e.g., DIRECT, DRVEXR, DRVTST, HISTRY, ERASE, VERIFY, DKUTIL, PARAMS) that are built into the ISEs for diagnostics, data management, and status monitoring, accessible via VMS, console commands, or MDM.

Lastly, the document provides troubleshooting procedures, outlining Power-On Self-Tests (POST) and internal diagnostics, explaining LED indications for failures, and guiding users on how to use local programs to gather error information. It concludes with a description of the various Digital Customer Services available for maintenance and support.