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Dell PowerEdge Server Foundations Online Training Course
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Course OverviewThis image displays a navigation arrow
PowerEdge System Components This image displays a navigation arrow
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System Board Features
Overview
Slotted System Boards
I/O Connectors
Memory Riser Card
Socketed System Boards

Power Subsystems
Overview
PSPBs
PDBs

Storage Subsystems
PERC Overview
Integrated PERCs
PCI Card PERCs
Adaptec PERC BIOS
AMI PERC BIOS
SCSI Backplanes

Network Interface Cards
Overview
Intel NICs
Broadcom NICs

Dell Remote Management Cards
Overview

Components Review
Section Review
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PowerEdge Chassis & Rack DesignsThis image displays a navigation arrow
PowerEdge System Setup Program (BIOS) and FirmwareThis image displays a navigation arrow
The Dell Server AssistantThis image displays a navigation arrow
PowerEdge Utility Partition & ApplicationsThis image displays a navigation arrow
Course ReviewThis image displays a navigation arrow
Course Feedback
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PowerEdge System Components

Power Supply Distribution Board (PSDB)

Redundant Power Supplies

Smaller servers (such as this PowerEdge 2550) often use a 1+1 configuration with one redundant power supply and one active power supply.

This sort of configuration uses a PSDB, or Power Supply Distribution Board (sometimes referred to as a PDB, or Power Distribution Board, as well).

Unlike a PSPB, a PSDB does not spread the power load between multiple active power supplies. The PSDB provides redundancy and hot swapping only, allowing a backup power supply to give power if the active supply fails.

As an example, a server could have two 250-watt power supplies connected to a PSDB. The system would be using 250 watts from the active power supply, with the second power supply inactive unless the primary power supply were to fail. If the power supply did fail, a replacement could be installed without bringing the server down.

The smallest servers (such as a PowerEdge 1550) may have no redundant power at all, with one power supply plugged directly into the system board. If the power supply fails in this configuration the system will not be operational until the power supply is replaced.


Integrated AC Transfer Switch
The integrated AC transfer switch provides redundant power to the PowerEdge 4600. Two AC inputs are available to the switch. One of the inputs is designated as primary and is used for powering the system. The system can operate from either input and will automatically switch from an AC input that fails to the other AC input. This feature allows a system administrator to assign a system to a selected power circuit in multi-circuit data centers.

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