There are several caveats that you need to be aware of:
Resources created on OES cannot run on NetWare.
You cannot add additional NetWare nodes to your cluster after adding a new OES node or changing an existing NetWare cluster node to an OES cluster node. If you want to add NetWare cluster nodes after converting part of your cluster to OES, you must first remove the OES nodes from the cluster.
The server that holds the master eDirectory replica needs to be converted last, at the end of the rolling cluster conversion, not first.
You can't change existing shared pools or volumes (storage reconfiguration) in a mixed NetWare/OES cluster. If you need to make changes to existing pools or volumes, you must temporarily bring down either all OES cluster nodes or all NetWare cluster nodes prior to making changes. Attempting to reconfigure shared pools or volumes in a mixed cluster can cause data loss.