Novell Doc: OES 1 - Software Requirements

3.2 Software Requirements

You must have NetWare 6.5 running on each cluster server. Ensure that the following requirements are met:

All servers in the cluster are configured with the IP protocol and on the same IP subnet
An additional IP address for the cluster and each cluster resource and cluster-enabled volume
All servers in the cluster are in the same Novell eDirectory™ tree
If the servers in the cluster are in separate eDirectory containers, each server must have rights to the other server's containers and to the containers where any cluster enabled pool objects are stored. You can do this by adding trustee assignments for all cluster servers to a parent container of the containers where the cluster server objects reside. See eDirectory Rights in the eDirectory 8.7.3 Administration Guide for more information.
All servers in the cluster are configured to use the NSS file system
NSS is the only file system supported for Novell Cluster Services.