Using VoltDB

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7.4. Updating the Hardware Configuration

Another change you are likely going to want to make at some point is changing the hardware configuration of your database cluster. Reasons for making these changes are:

  • Increasing the number of nodes (and, as a consequence, capacity and throughput performance) of your database.

  • Benchmarking the performance of your database application on different size clusters and with different numbers of partitions per node.

To change the number of nodes or the number of partitions per node, you must first save and shutdown the database. You can then edit the deployment file specifying the new number of nodes and partitions per node in the attributes of the <cluster> tag.

Once your have created a new deployment file with the desired hardware configuration, restart the database and reload the data using the voltadmin restore command. See Section 9.1.3, “Changing the Database Schema or Cluster Configuration Using Save and Restore” for details on saving and restoring your database manually.

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