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Connect to one of the existing nodes of your cluster and run the following from a SQL prompt. The IP(s) specified are those for new nodes being added. 

Add nodes to your cluster
sql> ALTER CLUSTER ADD 'ip' [, 'ip'] ...; 

ClustrixDB will perform a Group Change to add new node(s). 

Clustrix recommends running this command during non-peak periods or during a scheduled maintenance window.

There will be a short disruption of service while the node(s) are being added.

You may also notice a slight degradation of performance while the Rebalancer moves data to the new node(s).

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