8 Contents9 Configuration: About Your Host . . . . . . . 93Configuring Host Access . . . . . . . . . . . . . . . . . 93Using the Mappings Tab . . . . . . . . . . . . . . . . . 94Defining a Host . . . . . . . . . . . . . . . . . . . 94Removing Host Access . . . . . . . . . . . . . . . . . . 96Managing Host Groups . . . . . . . . . . . . . . . . . . 96Creating a Host Group . . . . . . . . . . . . . . . 96Moving a Host to a Different Host Group . . . . . . 97Removing a Host Group . . . . . . . . . . . . . . . 98Host Topology . . . . . . . . . . . . . . . . . . . . 98Starting or Stopping the Host Context Agent . . . . 99I/O Data Path Protection . . . . . . . . . . . . . . . . 100Managing Host Port Identifiers . . . . . . . . . . . . 10110 Configuration: Disk Groupsand Virtual Disks . . . . . . . . . . . . . . . . . . 103Creating Disk Groups and Virtual Disks . . . . . . . . 103Creating Disk Groups . . . . . . . . . . . . . . . 104Locating a Disk Group . . . . . . . . . . . . . . 106Creating Virtual Disks . . . . . . . . . . . . . . . 106Changing the Virtual DiskModification Priority . . . . . . . . . . . . . . . 108Changing the Virtual Disk Cache Settings . . . . 109Changing the Segment Size of a Virtual Disk . . . 111Changing the I/O Type. . . . . . . . . . . . . . . 112Choosing an Appropriate Physical Disk Type . . . . . 113Physical Disk Security with Self Encrypting Disk . . 113