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The enclosure ID, comprised of two seven-segment numbers, is located on the
back of each controller next to the controller indicator lights. It provides a unique
identifier for each module in the storage array. The DS4200 Express Storage
Subsystem is shipped from the factory with the enclosure ID typically set at 85. You
can only change the enclosure ID setting through the DS4000 storage management
software. There are no switches on the DS4200 Express chassis to manually set
the enclosure ID. Both controller enclosure ID numbers will be identical under
normal operating conditions.
Figure 2 shows the controllers ports for the DS4200 Express.
Figure 2. Back view; connectors, switch, ports, enclosure ID for the DS4200 Express
Table 2. Description of Figure 2
Number
1
2
3
4
5
6
7
Power supply and fan units
The storage subsystem has two removable power supply and fan units. Each power
supply and fan unit contains one power supply and two fans. The four fans pull air
through the drive from front to back across the drives.
The fans provide redundant cooling, which means that if one of the fans in either
fan housing fails, the remaining fans continue to provide sufficient cooling to
operate the storage subsystem. The power supplies provide power to the internal
components by converting incoming AC voltage to DC voltage. If one power supply
is turned off or malfunctions, the other power supply maintains electrical power to
the storage subsystem and the two fan modules in the turned off or malfunctioned
power supply-fan unit. (All four fan modules function at all times even if one power
supply and fan unit is switched off unless the fan module malfunctions.)
7
6
5
4
1
Description
Controller A
Controller B
Host channels
Ethernet ports
Serial port
Dual-ported drive channel
Enclosure ID
3
3
4 5
2
6
7
Chapter 1. Introduction
9
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