# Add the Pentaho Data Optimizer service to the cluster

To add Data Optimizer to your cluster, perform the following steps:

1. Log in to the Cloudera Manager dashboard.
2. Navigate to the cluster and open the action menu dropdown for the cluster then select **Add Service**.
3. Select Pentaho Data Optimizer from the list of available services and click **Continue**.
4. Assign hosts for the **Volume** role.
   1. On the Assign Roles page, locate the **Volume** role for the Data Optimizer service and click the Volume dialog box.
   2. Select the hosts to assign to the **Volume** role and click **OK**.

      Only hosts that have the HDFS Datanode role are valid candidates to add the Data Optimizer **Volume** role.
5. Assign hosts for the **Volume Monitor** role:
   1. Navigate back to the Assign Roles page and locate the named **Volume Monitor** for the Data Optimizer service.
   2. Click the **Volume Monitor** dialog box then assign hosts in your cluster to the **Volume Monitor** role.
   3. If prompted, select **Custom**.
   4. Select each of the hosts to which you added the **Volume** role and click **OK**.

      **Note:** Each host with a **Volume** instance must have a **Volume Monitor** instance as well. Do not select hosts without a **Volume** instance.
6. Click **Continue**.
7. Proceed to the Review Changes page. then enter the Data Optimizer volume configuration parameters for your environment.

   See the [Data Optimizer configuration parameters](/pdc-10.2-data-optimizer/pdso-install-landing-page/pdso-install-in-hadoop-cluster/pdso-configure-data-storage-optimizer/pdso-configuration-parameters.md) section for information about how to configure Data Optimizer volumes.

   **Note:** Remember the value of the `MOUNT_POINT` parameter. You will need this value when configuring HDFS to use the Data Optimizer volume.
8. After you have entered and confirmed all your Data Optimizer configuration values, click **Continue**.

   The Command Details page opens. From here, you can monitor the **First Run Command**.

   At this point in the process, Cloudera Manager attempts to start the service and launch the **Volume** instances for the initial time.
9. Monitor the start commands as they run in the background. Verify that all **Volume** and **Volume Monitor** instances start without error.
10. (Optional) If you encounter errors, you may need to troubleshoot.
    1. Look at the `stdout`, `stderr`, and role logs in the Cloudera Manager UI.
    2. If necessary, see [Troubleshoot Data Optimizer](/pdc-10.2-data-optimizer/pdso-install-landing-page/pdso-install-in-hadoop-cluster/pdso-maintain-landing-page/troubleshoot-data-storage-optimizer-fs.md).
11. After all Data Optimizer volumes have started, you can click through the remaining pages in the Add Service wizard to return to the Cloudera Manager dashboard.


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