Re: FW: [Xen-cim] Bridge

[Jim Fehlig <jfehlig@xxxxxxxxxx>]

Gareth S Bestor wrote:

> Sorry. I wasnt able to make the call this morning (pity, we could've 
> used my conf # again by the sounds of it! :-)
> How'd it go?
We didn't spend much time on the call.  Talked about the SVPC f2f 
briefly.  Raj is working on the associations he mentioned in a previous 
post.  I have moved on to the management service.
I did have some questions for you regarding implementation of 
VirtualSystemManagementService.
1. Should we support start/stop service?  Currently these methods 
start/stop xend - seems like suicide and not nice for other management 
tools :-).  I think we should mark these "not supported" for the time.
2. How to handle the embedded instance parameters in various extrinsic 
methods?  When I first noticed these parameters in the profile / mof I 
thought of using OpenWBEM's mof compiler library - assuming the encoding 
of embedded instances was mof.  However this approach in not cimom 
agnostic and thus not an option for this project.  How do you envision 
handling the embedded instances in CMPI?  Also, I read Appendix H of
  http://www.dmtf.org/standards/published_documents/DSP0004V2.3_final.pdf

and it is not clear how one specifies which encoding is in use.  Does an 
implementation have to support both encodings?
3. We talked about implementing RequestStateChange() intrinsic method in 
Xen_ComputerSystem.  Should we implement the corresponding extrinsic 
methods in VirtualSystemManagementService or just map them to 
appropriate RequestStateChange?  For example, should 
PauseVirtualSystem() just call RequestStateChange("Paused") on the 
referenced Xen_ComputerSystem or provide an implementation?
4. Some of the extrinsic methods are going to be quite messy to 
implement I believe.  DefineVirtualSystem() for example is overloaded.  
The implementation has to parse through all of the embedded resource 
instances, supply defaults for required resources that were not 
provided, supply default properties for resources provided but no 
property value provided, etc.  How does the implementation report a 
reasonable error in the event something fails in this process?
5. Job control.  Currently no support for job control in the providers.  
Does CMPI have thread support?  (Obviously I need to spend some time in 
the CMPI spec :-)).  We will need some generic job control support for 
the various services that potentially return job IDs 
(VirtualSystemManagementService, ResourcePoolConfigurationService).  We 
can just go with synchronous support in the short term.
Jim


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