Any time that you automatically or manually failover a node, the cluster capacity will be reduced. Once a node is failed over:
The number of available nodes for each data bucket in your cluster will be reduced by one.
Replicated data handled by the failover node will be enabled on other nodes in the cluster.
Remaining nodes will have to handle all incoming requests for data.
After a node has been failed over, you should perform a rebalance operation. The rebalance operation will:
Redistribute stored data across the remaining nodes within the cluster.
Recreate replicated data for all buckets at remaining nodes.
Return your cluster to the configured operational state.
You may decide to add one or more new nodes to the cluster after a failover to return the cluster to a fully functional state. Better yet you may choose to replace the failed node and add additional nodes to provide more capacity than before. For more information on adding new nodes, and performing the rebalance operation, see Section 5.7.2, “Performing a Rebalance”.