vServer (cluster-mode only): Vservers can be thought of as a secure virtual storage system. It is made up of the volumes, which can be joined in a name space hierarchy, for NAS workload or the volumes could be individual sub-containers of LUNs, for a SAN workload. Vservers can be easily modified as well, scaling to several petabytes as needed.
Differences between vfiler and vservers:
Vservers in Cluster-Mode supersede vFiler capabilities by providing a single namespace, using resources from many nodes within the cluster, support for any Cluster-Mode data protocol, and includes fully-delegated role-based access control.
thank you
AK G