42 IBM Midrange System Storage Hardware Guide
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
packs.
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.
Controller B (bottom)
Controller A (top)
Front
Left Power/Fan Canister Interconnect Canister Right Power/Fan Canister
A B A B
Battery Packs
Charger
Charger
Power
Supply
Charger
Charger
Power
Supply
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