You can create a vFiler unit when you want to partition the storage and network resources of a single storage system. You can create a vFiler unit by either using the vfiler create command from the command-line interface or System Manager.
When you create and associate a vFiler unit with the IPspace that is used by a stopped vFiler unit belonging to the same subnet, the default or static routes are migrated from the stopped vFiler unit to the newly created vFiler unit.