Compaq Storageworks Installing an External Cache Battery

This document provides instructions for replacing an External Cache Battery (ECB) in Compaq HSZ70, HSG80, and HSZ80 array controllers. The procedures differ based on whether the configuration is a dual-redundant controller or a single controller, and also includes steps for specific HSG80/HSZ80 versions, some allowing for "cabinet power on" replacement.

General Steps for ECB Replacement:

1. Connect a PC or terminal to the controller.
2. Disable failover for dual-redundant configurations.
3. Shut down the controller(s) and/or turn off subsystem power as specified for the particular model and configuration.
4. Insert the new ECB Storage Building Block (SBB) into an empty slot (or place it on top of the enclosure if no slot is available immediately).
5. Connect the ECB Y cable to the new ECB.
6. Restore power to the subsystem, allowing controllers to restart.
7. Crucially, do NOT disconnect the old ECB until the new ECB's batteries are fully charged. The new ECB's status light will be continuously lit when fully charged (a blinking light indicates charging).
8. Once the new ECB is fully charged, disconnect the ECB cable from the old ECB.
9. For HSZ80 models, use the FRUTIL utility to reset the battery life counter.
10. Remove the old ECB SBB.
11. For dual-redundant configurations, enable failover to re-establish the dual-redundant setup.

Key Cautions:

• Handle the ECB cable carefully to avoid damaging the 12-volt and 5-volt pins, which can lead to cache module damage.
• Always ensure the new ECB is fully charged before disconnecting the old one.