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Xen 3.0 Virtualization Interface Guide
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8.2 Block I/O

All guest OS disk access goes through the virtual block device VBD interface. This interface allows domains access to portions of block storage devices visible to the the block backend device. The VBD interface is a split driver, similar to the network interface described above. A single shared memory ring is used between the frontend and backend drivers for each virtual device, across which IO requests and responses are sent.

Any block device accessible to the backend domain, including network-based block (iSCSI, *NBD, etc), loopback and LVM/MD devices, can be exported as a VBD. Each VBD is mapped to a device node in the guest, specified in the guest's startup configuration.

Xen 3.0 Virtualization Interface Guide
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  Published under the terms of the GNU General Public License Design by Interspire