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5.10 Mapping Physical Storage to
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" (page 30), 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
Protocol
phy:
file:
tap:aio:
tap:vmdk:
nbd:
tap:qcow:
52
Virtualization with Xen
Virtual Disks
)
uname Settings
Description
Block devices, such as a physical disk,
in domain 0
Raw disk images accessed by using
loopback
Raw disk images accessed by using
blktap. Similar to loopback but with
better performance
VMware disk images accessed by using
blktap
Raw disk images accessed by using NBD
QEMU disk images accessed by using
blktap
Example
phy:/dev/xvda
file:/path/file
tap:aio:/path/file
tap:vmdk:/path/file
ndb: ip_port
tap:qcow/path/file
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