As documented in the N1System Manager product documentation, the bge1 device path for Sun Fire V20z servers is /pci@0,0/pci1022,7450@a/pci17c2,10@3. However, when specifying the bge1 device path for the bootpath attribute, the OS deployments will fail on newer Sun Fire V20z servers because the bge1 device path has changed.
Workaround: On newer Sun Fire V20z servers, use the following bge1 device path for the bootpath attribute: /pci@0,0/pci1022,7450@a/pci17c2,10@2,1