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SG0-001 · Question #182

Three phase power has been connected to a rack with a storage array. Which of the following would be best practice if each of the three phases were routed to independent Power Distribution Units (PDUs

The correct answer is D. Each device should use two separate PDUs to ensure power redundancy. E. Each PDU (Phase) should be loaded equally where possible to balance the power.. When utilizing three-phase power with independent Power Distribution Units (PDUs) per phase, best practices include ensuring device power redundancy and balancing the load across all phases.

Storage Implementation

Question

Three phase power has been connected to a rack with a storage array. Which of the following would be best practice if each of the three phases were routed to independent Power Distribution Units (PDUs)? (Select TWO).

Options

  • AEach PDU (Phase) should be consumed before moving to the next phase to preserve
  • BThree phase power is not supported with most Datacenter Class Equipment.
  • CTo prevent phase imbalance, partnered power supplies should connect to the same PDU
  • DEach device should use two separate PDUs to ensure power redundancy.
  • EEach PDU (Phase) should be loaded equally where possible to balance the power.

How the community answered

(28 responses)
  • A
    7% (2)
  • B
    11% (3)
  • C
    4% (1)
  • D
    79% (22)

Why each option

When utilizing three-phase power with independent Power Distribution Units (PDUs) per phase, best practices include ensuring device power redundancy and balancing the load across all phases.

AEach PDU (Phase) should be consumed before moving to the next phase to preserve

Consuming one PDU/phase completely before moving to the next is a poor practice that would lead to severe phase imbalance and potential overload of that single phase, increasing risk.

BThree phase power is not supported with most Datacenter Class Equipment.

Three-phase power is widely supported and commonly used in datacenters for high-density racks and datacenter-class equipment due to its efficiency and ability to deliver more power.

CTo prevent phase imbalance, partnered power supplies should connect to the same PDU

Partnered power supplies (e.g., in a redundant power configuration for a single device) should connect to different PDUs to maintain redundancy, as connecting to the same PDU would negate the redundancy if that PDU failed.

DEach device should use two separate PDUs to ensure power redundancy.Correct

Connecting each device to two separate PDUs ensures power redundancy; if one PDU or its associated power phase fails, the device can continue to operate using the alternate power source.

EEach PDU (Phase) should be loaded equally where possible to balance the power.Correct

Loading each PDU (and thus each phase) equally helps prevent phase imbalance, which can lead to inefficient power usage, increased stress on the electrical system, and potential outages from overloaded phases.

Concept tested: Datacenter power redundancy and load balancing

Source: https://www.schneider-electric.com/ww/en/faqs/FA34641/

Topics

#power redundancy#PDU#load balancing#three-phase power

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