Chapter 5. Virtualization: Configuration Options and Settings / 5.10. Mapping Physical Storage to Virtual Disks
	5.9. Virtual Keyboards		5.11. Virtual Disks

Mapping Physical Storage to Virtual Disks

To specify a mapping between physical storage and the virtual disk, you might need to edit the virtual machine’s disk information. Follow the instructions in Section 4.3, “Configuring a Virtual Machine by Modifying its xend Settings”, to change the respective device entry to the desired setting.

Example 5.3. Example: Virtual Machine Output from Xend

(vbd
  (dev xvda:disk)
  (uname file:/var/lib/xen/images/oes2l/disk0)
  (mode w)
  (type disk)
  (backend 0)
        )

Table 5.3. uname Settings

Protocol	Description	Example
phy:	Block devices, such as a physical disk, in domain 0	`phy:/dev/xvda`
file:	Raw disk images accessed by using loopback	file:/path/file
tap:aio:	Raw disk images accessed by using `blktap`. Similar to loopback but with better performance	tap:aio:/path/file
tap:vmdk:	VMware disk images accessed by using blktap	tap:vmdk:/path/file
nbd:	Raw disk images accessed by using NBD	ndb: ip_port
tap:qcow:	QEMU disk images accessed by using blktap	tap:qcow/path/file
iscsi:	iSCSI targets using connections initiated from domain 0	iscsi:IQN,LUN
npiv:	Fibre Channel connections initiated from domain 0	npiv:NPIV,LUN