perfsonar development work

["Nina Jeliazkova" <>]

Joe,

Thanks for the comments. As I understood, the decision is up to the client to
provide the slice of information most relevant for the end users; and this may
differ across the user groups and client software.

Best regards,
Nina

Joe Metzger 
<>
 wrote:

> 
> On Aug 14, 2008, at 3:41 AM, Nina Jeliazkova wrote:
> >
> > However, Maciej had a different view ( don't restrict the answer to  
> > one subnet, present everything to the user, see emails below ), so  
> > we thought it will be best to move the discussion into the  
> > developers mailing list.
> >
> > In summary,  my question is as follows (having in mind only the use  
> > case when the user is asking for list of IPs coming from a  
> > traceroute and a given eventtype, i.e. subnet mask 32 )
> >     • Is there a chance, that information for a given IP and given  
> > eventtype (e.g. utilization) is provided by more than one (MA)  
> > service ?
> 
> Once the rest of my infrastructure is ready I should always have 2  
> geographically distributed
> MA's with very similar utilization data for any ESnet interface.  This  
> is a critical part of
> the architecture as far as I am concerned.  During network outages or  
> server maintenance,
> it is quite possible that one of the systems will have holes in the  
> data.
> 
> We have also contemplated having 3 MA's.  2 of which are based on  
> independent systems that
> are doing active polling and have the current data for the last week  
> (or month), and a 3rd,
> which will have archived historical data which is synthesized from the  
> 2 servers, with any
> data holes filled in.
> 
> 
> >     • If yes, how do we visualize that and assure the information is  
> > consistent?
> 
> People working on operational purposes will want one display with the  
> 'best' data.
> 
> People working on network research, or measurement maintenance will  
> want to see all
> the data, and be especially interested in when various sources are  
> different.
> 
> So, I think the default could be to pick one.  But eventually we will  
> want the ability
> to select and compare the data from multiple servers.
> 
> 
> >     • If not, what is the reason of looking into multiple options?
> > Discussion on other use cases are of course welcome :)
> >
> > Best regards,
> > Nina
> 
>