# Multiple Choice Question

+ There are currently three TiKV nodes in my TiDB Cluster. The replication factor of the TiKV is three. In order to improve the high availability of the TiDB cluster, the operations team decides to scale out the number of TiKV nodes to five. With this change, how many TiKV nodes failure can the cluster tolerate?
+ a) 1
+ b) 2
+ c) 3
+ d) 4
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Answer: a). Since the replication factor is still three, the cluster can tolerate one TiKV node failure at most.