EVS name spaces

Server and Cluster Administration Guide for Hitachi NAS Platform

Part Number

An EVS name space allows separate file systems within a virtual server (EVS) to appear as subdirectories of a single logical file system (that is, as one unified file system). An EVS name space can also make multiple storage elements on the virtual server available to network clients through a single CIFS share or NFS export.

The EVS name space functions in the same way as the cluster name space (CNS), except that its context is that of the EVS instead of the cluster.

To create an EVS name space, you must have installed a CNS license and an EVS Security license, and you must have set the EVS to use an individual security context.

Linking to and from an EVS name space has the following constraints:

  • Links within an EVS name space. In an EVS name space tree, you can add links from the EVS name space to file systems hosted by the same secure EVS.
  • Links between the CNS and the EVS name spaces. The contexts of the Cluster Name Space and the EVS name space are mutually exclusive: links from one to the other are not allowed.
  • Links outside the EVS name space. Links from the individual EVS name space to file systems in other EVSs are not supported.