What is the minimum number of nodes required to create a Storage Data Server (SDS)?

Question

Options

• A2
• B3
• C4
• D5

• A
  4% (1)
• B
  89% (24)
• D
  7% (2)

Explanation

A Storage Data Server cluster requires a minimum of 3 nodes because distributed storage systems rely on a quorum - a majority consensus - to maintain data consistency and handle node failures. With 3 nodes, one can fail while the remaining two still form a majority, preventing data loss or split-brain scenarios. Option A (2 nodes) fails because two nodes cannot achieve quorum if one goes offline - there's no tiebreaker, leaving the system unable to determine which copy of data is authoritative. Options C (4) and D (5) are valid cluster sizes but exceed the minimum; they also introduce unnecessary complexity, and even-numbered clusters (like 4) can still suffer split-brain without additional tie-breaking mechanisms. Memory tip: Think "3 is the minimum odd number that allows a majority vote" - in distributed systems, odd numbers ≥ 3 are the golden rule for quorum, and 3 is simply the smallest that qualifies.

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