DSSI Warm Swapping Guide for BA400-Series Enclosures and KFQSA Adapters

This document, titled "DSSI Warm Swapping Guide for BA400-Series Enclosures and KFQSA Adapters" (Order Number: EK-457AA-SG-001), provides detailed procedures for "warm swapping" Digital Storage Systems Interconnect (DSSI) field-replaceable units (FRUs). Warm swapping refers to the process of powering off and removing a DSSI FRU from an active DSSI bus without affecting the availability of the host system or the rest of the DSSI subsystem.

Intended for Digital Services personnel and self-maintenance customers, the guide covers:

• Understanding DSSI Warm Swapping: Concepts, minimum requirements, and physical properties of the DSSI bus (termination, continuity, VTERM, power cycling limitations).
• Supported and Non-Supported Devices: Identification of specific DSSI devices (CPUs, KFQSA adapters, RFxx/TFxx ISEs) that do and do not support warm swapping procedures.
• Warm Swapping Procedures: Detailed steps for CPU modules, KFQSA Q-bus DSSI modules, and DSSI Integrated Storage Elements (ISEs). This includes considerations for system enclosures, VMS software shutdown, and the physical removal and installation of components.
• Parameter Management: Instructions for obtaining, recording, and restoring module-specific parameters (e.g., CPU console parameters, KFQSA configuration tables, ISE parameters) using various console commands, VMS diagnostic utilities (DUP), and VMS system commands (like SHOW DEVICE, ANALYZE/SYSTEM, PARAMS).
• Auxiliary Information: Appendices provide lists of related documentation, a comprehensive guide on using the VMS DISMOUNT command for open files, and blank worksheets for recording ISE parameters.