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Re: [libvirt] PATCH: support virtual disks

On 06/11/2010 03:52 AM, Andrew Farmer wrote:
Libvirt currently makes the assumption that disk devices are always
accessible as files on the local system. However, certain types of
virtual storage on qemu (e.g, NBD) may not be. This patch defines a
new "virtual" disk device which is treated similarly to existing disk
types, but which is exempted from at least one code path
(qemuSecurityDACSetSecurityAllLabel) which assumes the disk to be
accessible as a file.

With this patch in place, a QEMU virtual disk can be declared as:

<disk type='virtual' device='disk'> <driver name='qemu' type='nbd'
/> <source path='nbd:nbdhost:1234' /> <target dev='vda' bus='virtio'
/> </disk>

I haven't tested this with any drivers besides QEMU, so there might
be some adjustments needed for those as well. Having the
infrastructure in place to create these devices makes it easier to
add them in the future, though.

Hi Andrew,

Haven't taken a look at how NBD devices attach to the host system yet, so I'm just trying to understand the concept here.

I'm used to some other network storage types (ie SRP LUNs), that when configured on a host system present as a disk device. These can then be configured using various storage pool types (ie disk, dir, fs, etc) as per a "standard" locally attached device.

Kind of wondering if NBD should be like that too?

Regards and best wishes,

Justin Clift

Salasaga  -  Open Source eLearning IDE

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