perfsonar development work

["Jeff W. Boote" <>]

Hi Nina,

I agree with this. In fact, I think this is more the rule than the  
exception (that data will be available from more than one location).

BTW. This is also what Jason wrote in one of the first responses  
yesterday. Did no one else see his response? It is in the archive and  
I saw it, but I'm wondering if no one else did... He is a beta-tester  
for a new Internet2 mail server, and I'm wondering if that server is  
black-listed somehow.

Thanks,
jeff

On Aug 14, 2008, at 11:42 PM, Nina Jeliazkova wrote:

> 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