perfsonar development work

[Jason Zurawski <>]

Nicolas;

> > > During yesterday conf call with JRA3-4, it was mentioned that at 
> > > this stage, the discovery functionality isn't needed as the 
> > > visualisation tools download all the L2 circuit information from the 
> > > MA/MPs and stitch them together to display them. So it seems that at 
> > > this stage, the functionality isn't needed yet for JRA3-4 application.
> > >
> > > It was mentioned that at some point, some scalability issues may be 
> > > encountered and that a discovery mechanism may be needed. However, 
> > > no information explaining when the scalability issues would be 
> > > encountered were given.
> > >
> > > Can I ask Mark and Matthias to give an estimate about when their 
> > > tool would need to use a discovery mechanism (because too many 
> > > MA/MP, because new circuits are coming regularly and the number of 
> > > MP/MAs varies greatly, or because too many circuits and a manual 
> > > file doesn't do it anymore).
> >
> > We don`t expect scalability issues. Following our architecture, we do 
> > not need a discovery mechanism for L2 circuit information. Howerver, 
> > we would like to have the possibility of finding the URLs to MPs and 
> > MAs by using a lookup service. This should also solve the poblem of 
> > discovering backup for unreachable MPs/MAs.
>
> The querry you would expect to run would be the following:
> "Give me the list of services where I can find L2 status information." 
> and you would be returned a list of MAs and MPs (and domains or just 
> the URL?), plus a list of LS to contact to get furhter information (as 
> the LS are distributed). The you can ask recursively the question to 
> the other LSes (filtering out the ones you have already visited).
>
> Jason, is it how it will be expected to work?

Depending on the complexity of the query (and the willingness of the LS 
maintainer) the information returned will vary.  I think it is perfectly 
reasonable to be able to get at least the contact URL if not a richer 
set of information.

-jason