Re: [Xen-API] Xen-CIM, libvirt, and Xen tools stack

["Daniel P. Berrange" <berrange@xxxxxxxxxx>]

On Tue, Aug 15, 2006 at 03:42:29PM -0600, Jim Fehlig wrote:
> All,
> 
> Given the recent work by Ewan and company on a Xen Management API and C 
> binding, the Xen-CIM project must now decide which API to use - either 
> the C binding directly or libvirt.  The Xen-CIM project planned to use 
> libvirt all along, but given the developments over the past few months 
> we must now decide whether to continue on this path or move directly to 
> the C binding.
> 
> I will start a list some pros and cons that we can expand and ultimately 
> use to determine the appropriate path moving forward.
> 
> Reasons to stay with libvirt:
> - Xen-CIM providers would inherit libvirt's ability to work with 
> arbitrary virtualization technologies
> - Related to above, libvirt could become a standard API for managing 
> various virtualization technologies
> - When on box, libvirt can provide optimizations for satisfying a request

Just add one other which may be important for people with existing Xen
deployments which need managing:

- Compatability with Xen 3.0.2 and 3.0.3 releases 

> Reasons to use C binding directly
> - libvirt must expose all of the functionality described in the 
> management API spec before the providers can make use of it
> - libvirt introduces another layer of code, assuming it eventually uses 
> the C binding as well
> - libvirt is not 'in tree'  (I do not have a problem with this but have 
> heard it mentioned before so wanted to include it)

Dan.
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