PrestoServe/NVRAM Option Information

This document provides comprehensive guidance for the PrestoServe/NVRAM option on the DECsystem 5100. It covers:

• Introduction: Explains the function of the nonvolatile RAM (NVRAM) as a disk write cache to improve I/O throughput and protect against data loss.
• Installation: Provides detailed, step-by-step instructions for installing NVRAM modules, including safety precautions (ESD), internal component access, and memory bank configuration requirements.
• Operation: Details the power-up self-test, console commands (including the prcache command for managing the cache), and procedures for safely moving NVRAM modules.
• Troubleshooting: Offers guidance on identifying failed modules, zeroing the cache, and recovering data after system module replacement.

The manual is intended for Customer Services personnel, self-maintenance customers, and general users, emphasizing the critical nature of these hardware components.