VA-003 Explain Vault architecture Practice Question
A Vault administrator is configuring a new Vault cluster with Integrated Storage (Raft). The administrator wants to ensure that the cluster can tolerate the failure of one node without data loss and that writes remain available. What is the minimum number of nodes required, and what is the recommended configuration for high availability?
⚠ Common exam trap
The trap here is assuming that two nodes provide redundancy, but Raft requires a majority quorum, so two nodes cannot tolerate a failure.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Three nodes, with one active and two standby nodes, because Raft requires a quorum of (N/2)+1 nodes to commit writes.
For a Vault cluster using Integrated Storage (Raft) to tolerate one node failure and maintain write availability, a minimum of three nodes is required. Raft uses a quorum of (N/2)+1 nodes to commit writes; with three nodes, a quorum is two, so one failure is tolerated. One node acts as the active leader, and the others are standbys.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Three nodes, with one active and two standby nodes, because Raft requires a quorum of (N/2)+1 nodes to commit writes.
Why this is correct
Raft uses a quorum to commit writes. With three nodes, a quorum is two, so one node can fail and the cluster remains available for writes. One node becomes the active leader, and the other two are standbys that can take over if the leader fails. This provides both fault tolerance and high availability.
- ✗
Two nodes, with one active and one standby, because Raft only needs a majority to elect a leader and two nodes provide a majority if one fails.
Why it's wrong here
With two nodes, a quorum is two (since (2/2)+1 = 2). If one node fails, the remaining node cannot achieve quorum, and the cluster becomes unavailable for writes. Therefore, two nodes do not provide fault tolerance for writes. Three nodes are the minimum for tolerating one failure.
- ✗
One node, because Integrated Storage (Raft) can operate in a single-node cluster and still provide high availability through automatic failover to a standby.
Why it's wrong here
A single-node cluster has no redundancy; if the node fails, the cluster is unavailable and data may be lost if not backed up. While Vault can run in a single-node configuration for development, it does not provide high availability or fault tolerance. Automatic failover requires multiple nodes.
- ✗
Five nodes, with one active and four standby, because Raft requires an odd number of nodes and five is the minimum for production.
Why it's wrong here
Five nodes provide higher fault tolerance (tolerating two failures) but are not the minimum. Three nodes are sufficient to tolerate one failure. Raft does require an odd number to avoid ties, but three is the smallest odd number that allows one failure. Five nodes increase cost and complexity without being required for the stated scenario.
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Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official HashiCorp exam blueprint
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