D-ECS-DS-23 · Question #33
Application retrieves secondary copy.
The question is incomplete - the Correct Answer field is blank, and only one choice (B) is shown. I'll explain B as written, but note this may be part of a larger set of distractors that were not included. --- Option B describes the mechanism used in erasure-coded or XOR-based…
Question
Application retrieves secondary copy.
Options
- B
- Available site checks for XOR copy on another online VDC.
Explanation
The question is incomplete - the Correct Answer field is blank, and only one choice (B) is shown. I'll explain B as written, but note this may be part of a larger set of distractors that were not included.
Option B describes the mechanism used in erasure-coded or XOR-based distributed storage (common in systems like VMware vSAN stretched clusters or similar multi-site architectures). When a primary data copy is unavailable, the available site performs an XOR parity calculation across surviving data chunks held at another online Virtual Data Center (VDC) to reconstruct and serve the missing data - this is the "secondary copy" retrieval path.
Without the other answer choices and the confirmed correct answer, it's not possible to explain why distractors are wrong.
Memory tip: Think "XOR = rebuild." Just like RAID-5 uses XOR to reconstruct a failed drive, multi-site storage uses XOR parity across VDCs to recover data when one site goes offline. If the site is online, it checks; if data is missing, it reconstructs via XOR.
Could you provide the full list of choices and the confirmed correct answer? That will let me give you a complete and accurate explanation.
Topics
Community Discussion
No community discussion yet for this question.