Chapter 1 Hardware Configurations
1.3 Enclosure Connection Path
ETERNUS DX80 S2/DX90 S2 Disk storage system User’s Guide -Site Planning-
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1.2.2 Power Supply Units

The power supply unit transforms input AC power from a power socket to DC power and supplies power to each
component. Two power supply units are installed in each drive enclosure.
Each power supply unit contains fans.
1.3 Enclosure Connection Path
For a dual-controller type, a controller enclosure (CE) is connected to drive enclosures (DE) with multiple
paths.
A drive enclosure has two independent drive interface ports. Path redundancy is maintained by connecting
the drive enclosure to two controllers directly. This configuration allows operation to continue even if one of
the connection paths fails.
Up to nine drive enclosures can be connected to a controller enclosure as shown in the figures below.
Figure 1.21 Enclosure connection path (dual-controller type)