graphdb/src/main/java/com/tinkerpop/blueprints/impls/orient/OrientBaseGraph.java
public OrientVertexType createVertexType(final String iClassName, final int clusters) {
    makeActive();
    return createVertexType(iClassName, (String) null, clusters);
  }
public OrientVertexType createVertexType(final String iClassName, final int clusters) {
    makeActive();
    return createVertexType(iClassName, (String) null, clusters);
  }
Creates a new Vertex persistent class.

@param iClassName Vertex class name
@param clusters   The number of clusters to create for the new class. By default the MINIMUMCLUSTERS database setting is used.
In v2.2 and later, the number of clusters are proportioned to the amount of cores found on the machine

@return OrientVertexType instance representing the persistent class