Vserver is the property of cluster data ontap. You can use vfiler in 7 mode.
Creating a vFiler unit
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.
You must have created an IPspace for a vFiler unit. Also you can use default ipspace.
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.