SG0-001 · Question #588
A new storage array is being cabled into a rack. The array has dual controllers, each disk tray has dual power supplies, and there are two in-rack PDUs (C and D). Which of the following is the BEST me
The correct answer is D. Split all PSU connections between C and D equally.. To ensure maximum availability for a storage array with redundant components and dual PDUs, power connections must be distributed such that a single PDU failure does not disrupt any critical component.
Question
A new storage array is being cabled into a rack. The array has dual controllers, each disk tray has dual power supplies, and there are two in-rack PDUs (C and D). Which of the following is the BEST method for hooking up power?
Options
- AConnect controller A's PSUs to PDU C, controller B's PSUs to D, alternate drive trays between
- BConnect all drive tray PSUs to C and all controller PDUs to D.
- CConnect both controller's PSUs to C and all drive tray PSUs to D.
- DSplit all PSU connections between C and D equally.
How the community answered
(69 responses)- A3% (2)
- B4% (3)
- C10% (7)
- D83% (57)
Why each option
To ensure maximum availability for a storage array with redundant components and dual PDUs, power connections must be distributed such that a single PDU failure does not disrupt any critical component.
Connecting all of Controller A's PSUs to PDU C and all of Controller B's PSUs to PDU D creates a single point of failure for each controller if its assigned PDU fails.
Connecting all drive tray PSUs to one PDU (C) and all controller PSUs to another (D) creates two major single points of failure, where the failure of either PDU would take down an entire critical subsystem.
Connecting both controllers' PSUs to PDU C and all drive tray PSUs to PDU D is an improper cabling method that creates multiple single points of failure, compromising redundancy.
Splitting all PSU connections between the two PDUs (C and D) ensures that for every redundant component (dual controllers, dual power supplies per disk tray), one power supply connects to PDU C and the other to PDU D. This setup provides full power redundancy, allowing the array to continue operating if either PDU fails.
Concept tested: Power redundancy, cabling best practices
Topics
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