create an image_data resource in the AIX part in the doc Setting up PE in a Stateful Cluster.
After I setup a stateful cn, the size of /opt is too small to install pe.rte.22.214.171.124. The /opt should be enlarged in image_data resource.
So I defined my own image_data. I added the image_data resource to xcat osimage.In the next diskfull setup, /opt was bigger,and pe.rte.126.96.36.199 was installed successfully.