Upgrade Ontap 8.3 to Ontap 9 root-data-data partition

Hi,

I updated a new FAS 2552 ( All SSD ) from 8.3.2 P2 to 9.oP1, after the update I initialized the system.

I was hoping dat I could create an aggregate with the root-data-data partitioning method so I get 2 aggregates both the same size next to the Root partitions.

( http://docs.netapp.com/ontap-9/index.jsp?topic=%2Fcom.netapp.doc.dot-cm-hacg%2FGUID-4E031540-57DB-41E8-AA4A-45466D59B7D2.html )

But unfortionally I was unable to do so, anybody know the solution  ?

Thanks