DIGITAL StorageWorks Ultra SCSI Cables (BN37A-Series) Installation Guide

This document provides instructions for the removal and installation of Ultra SCSI cables (BN37A-series) for DIGITAL StorageWorks RAID subsystems.

Key Procedures:

1. Turning Off the Subsystem (Crucial Pre-requisite):

   • Always shut down the subsystem completely before removing or installing cables to prevent data corruption.
   • This involves dismounting storage devices, connecting a maintenance terminal, shutting down both primary and redundant controllers, and finally turning off AC power to all enclosures.

2. Removing a Cable:

   • After the subsystem is off, loosen the spring-loaded mounting screws on the I/O module and pull it out.
   • Cut any wire ties and loosen thumb screws to detach the cable.
   • Important: To prevent configuration errors, DIGITAL recommends replacing one cable at a time.
   • Repeat the process for cables connected to the other I/O module.

3. Installing a Cable:

   • Remove the new cable from its electrostatic bag and verify the model.
   • Align the cable connector with the module, insert gently, and tighten the thumb screws.
   • Secure the cable to the support bracket using a wire tie.
   • Repeat this process for all necessary cable connections (Cable A, then Cable B, connecting to both I/O modules).
   • Install both I/O modules back into the enclosure, aligning them with the card guides and firmly seating them. Tighten the mounting screws, but do not overtighten.
   • Repeat these procedures for each cable being installed.

4. Turning On the Subsystem:

   • After all cables are installed, restore AC power to each enclosure.
   • Reset both the primary and redundant controllers (press and hold the Reset switch for at least 3 seconds).
   • Verify that both controllers are functioning correctly using the show other_controller command from a maintenance terminal.
   • Finally, check the entire subsystem for proper operation.