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Re: [libvirt] Node devices?



On 02/10/2010 07:23 PM, Ed Swierk wrote:
> On Wed, Feb 10, 2010 at 1:02 AM, Daniel P. Berrange <berrange redhat com> wrote:
>> Mostly what Alex already said :-)
>>
>> The libvirt APIs are split into several functional areas
>>
>>  - virDomain - guest management
>>  - virInterface - host network interface configuration
>>  - virStorage   - storage manangement
>>  - virNetwork   - virtual networking
>>
>> The goal is that an app should be able to accomplish all its virtualization
>> management tasks without needing any other remote access to the host via
>> SSH or other systems. Many of the APIs for those areas I mention above
>> require knowledge of what physical devices are present on the machine. For
>> example, assigning a PCI or USB device to a guests requires that you know
>> what PCI / USB devices the host has. Setting up a storage pool requires
>> knowing what disks are available. Configuring network interfaces requires
>> knowing what NICs are available, etc.  So 'virNodeDev' APIs provide the
>> missing link that lets you discover the information about a host that you
>> need in order to use the other APIs.
> 
> Thanks, Daniel and Alex, that helps a lot.
> 
> I'm still not clear about the purpose of the node device XML format,
> and the nodedev-create virsh command. What does it mean to "create a
> device" on a node, if the node device info is gathered via udev or hal
> from the actual hardware? Is this to fill in gaps in udev's or hal's
> knowledge of the hardware?
> 

The nodedev-create function is currently only used to create NPIV virtual
adapters. It's true in general that 'creating' a node device doesn't really
make sense, since a node device is actually physical hardware, hence the very
limited application ATM.

Similarly nodedev-destroy destroys NPIV virtual adapters.

- Cole


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