Battery Units; Power Supply And Fan Unit And Airflow - IBM DS4200 Installation, User's, And Maintenance Manual

Express storage subsystem
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Figure 4. Power supply and fan unit and airflow

Battery units

Each controller also contains a rechargeable battery unit that maintains data in the
cache in the event of a power failure.
Figure 5 on page 12 shows how the battery unit slides into the battery backup slot
in controller A CRU.
11
Chapter 1. Introduction

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