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SK0-004 · Question #381

A technician installs a rack in a datacenter. The rack has two power strips installed in it. To ensure maximum power redundancy for the rack, how should each PDU power strip be connected?

The correct answer is D. Each to a different datacenter UPS. Connecting each PDU power strip to a separate UPS eliminates every single point of failure in the power chain, achieving maximum redundancy for the rack.

Server hardware installation and management

Question

A technician installs a rack in a datacenter. The rack has two power strips installed in it. To ensure maximum power redundancy for the rack, how should each PDU power strip be connected?

Options

  • AEach to the same floor PDU
  • BEach to different floor PDUs
  • CEach to the same datacenter UPS
  • DEach to a different datacenter UPS

How the community answered

(30 responses)
  • A
    7% (2)
  • B
    3% (1)
  • C
    7% (2)
  • D
    83% (25)

Why each option

Connecting each PDU power strip to a separate UPS eliminates every single point of failure in the power chain, achieving maximum redundancy for the rack.

AEach to the same floor PDU

Connecting both strips to the same floor PDU creates a single point of failure at that PDU, negating any redundancy benefit from having two strips.

BEach to different floor PDUs

Using different floor PDUs improves distribution but both PDUs may still be fed by the same UPS, leaving a single point of failure upstream.

CEach to the same datacenter UPS

Connecting both strips to the same UPS still leaves the UPS as a single point of failure, meaning a UPS failure would simultaneously drop both power strips.

DEach to a different datacenter UPSCorrect

Connecting each power strip to a different datacenter UPS creates two completely independent power paths from the utility or generator all the way to the equipment. If one UPS fails, loses battery, or is taken offline for maintenance, the second power strip - fed by the other UPS - continues to supply power uninterrupted, providing true N+1 or 2N power redundancy.

Concept tested: Datacenter power redundancy via independent UPS paths

Source: https://learn.microsoft.com/en-us/azure/well-architected/reliability/redundancy

Topics

#power redundancy#PDU#UPS#datacenter power

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