The Date and Time window opens (see Figure 3-94) when you select  Date and Time  from  the System menu. You can add a Network Time Protocol (NTP) server, if available. You can also update the license information for specific features, as shown in Figure 3-95. To upgrade your IBM Spectrum Virtualize, use the procedure that is described in Chapter 12,  “RAS, monitoring, and troubleshooting” on page 623.  Virtual Volume (VVol) is a tape volume that is in a tape volume cache of a virtual tape server  (VTS). VVol is a new feature that was introduced in IBM Spectrum Virtualize 7.6. By using this  new functionality, users can create volumes on IBM Spectrum Virtualize directly from a  VMware VCenter server.  Figure 3-94 Date and Time window Figure 3-95 Licensing options Chapter 3. Graphical user interface overview  153