To plan for the upgrade, you should familiarize yourself with the general upgrade considerations. If necessary, contact technical support for recommendations and guidance specific to the configuration of your cluster.
Requirements and limitations
ONTAP 9 Upgrade and Revert/Downgrade Guide
Find the Upgrade and Revert/Downgrade Guide for your version of Data ONTAP 8
When you upgrade by moving volumes, new nodes are joined to the cluster before the original nodes are removed. Ensure the number of controllers in the cluster does not exceed the supported maximum cluster size during the procedure.
ONTAP 9 Disks and Aggregates Power Guide
Find a Storage Management Guide for your version of Data ONTAP 8
For root aggregate size requirements, see the NetApp Hardware Universe
Converting a FAS2240 or FAS255x system to a drive shelf is an optional task in the workflow for upgrading by moving storage.
Transferring the internal storage is an optional task in the workflow for upgrading by moving storage.
Situations where additional steps might be needed