7.3.3 General Pane 7.4 Stretched volumes General Pane is shown in Figure 7-22. This pane gives the following options: Note:  The IBM Knowledge Center page on Stretched topology is available at  https://ibm.biz/BdYkQv . If the IBM Spectrum Virtualize system is set up in stretched topology, the  Create Volumes menu shows the Stretched option. Click  Stretched  to create a stretched volume and define  its attributes as shown in Figure 7-23 on page 292.  GLYPH<SM590000> OpenVMS UDID:  Each OpenVMS Fibre Channel-attached volume requires a  user-defined identifier or unit device identifier (UDID). A UDID is a nonnegative integer  that is used in the creation of the OpenVMS device name. GLYPH<SM590000> Cache mode:  Controls volume caching. Defaults to Enabled. Other available options are  Read-only and Disabled. GLYPH<SM590000> Format volume:  Controls whether the volume should be formatted before it is made  available. Defaults to Enabled. Figure 7-22 Custom volume creation – General pane Chapter 7. Volumes  291