Interconnect Module And Battery Packs - IBM Midrange System DS4000 Series Hardware Manual

Midrange system storage ds4000/ds5000 series

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3.4.4 Interconnect module and battery packs

The interconnect module provides the electrical communication path between the power

supply fan units and allows their power supplies to load-share and to charge the

cache-backup battery packs. It houses two cache-backup battery packs. Each battery pack

contains batteries for both controllers (Figure 3-15). An interconnect module works as a

midplane, so it also connects disk loops and buses to mirror cache data between controllers.

Figure 3-15 Power distribution

The DS5000 storage subsystem battery packs do not use the expiration dates. Only replace a

battery pack when the LEDs have indicated that they have failed (see "Interconnect module

LEDs" on page 54). You only have to replace the battery pack that failed, not both battery

Because write-caching is disabled when either one of the backup battery packs fails, you

should replace the failed battery pack as soon as possible to minimize any impact due to the

disabling of the write-caching function.

IBM Midrange System Storage Hardware Guide

Left Power/Fan Canister

Controller A (top)

Controller B (bottom)

Interconnect Canister

Battery Packs

Right Power/Fan Canister