# OPS Node Selection

Select the at least two nodes in the cluster, or select all nodes in the cluster with the Select all nodes button. The node running this application cannot be deselected.

If the list of nodes is not what you expect, the clusterware may not installed or configured on those nodes.

To resolve this problem:

1. Choose Back.

2. Ensure the clusterware is installed, configured and running on all nodes in the cluster, as described in vendor Operating System Dependent documentation.
3. Choose Next. The nodes should now be listed.