A 5-node etcd cluster spans three availability zones. Which placement keeps it writable when any one zone goes down?

Options

• ✓ 2, 2 and 1 nodes Correct
• ✗ 3, 1 and 1 nodes
• ✗ 3, 2 and 0 nodes
• ✗ All 5 in the most reliable zone

Why

Writes need 3 of 5. With 2/2/1, losing any zone leaves at least 3. With 3/1/1, losing the zone with 3 leaves only 2, and the cluster stops accepting writes. Spread the nodes so that no zone holds more of them than the cluster can lose.

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