DevOps · Flashcard
How many member failures can a 5-member etcd cluster tolerate?
- ATwo — a quorum of three remains, so the cluster keeps serving writes with two members down
- BFour — as long as one member survives it can continue committing writes on its own
- COne — any second failure immediately breaks consensus even though three members remain
- DThree — a minority of two members is still enough to form a working quorum for writes
Why this is the answer
With 5 members the quorum is 3, so up to 2 can fail and the remaining 3 still form a majority. One survivor cannot commit (no majority); it tolerates two, not one; and two members are a minority of five, so three failures break the quorum.
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