On Tue, 2005-02-22 at 14:41 +0000, Alessandra Forti wrote:
> So if there is no difference why using srmcp you need the data servers
> exposed to the internet?
Because data is transfered to and from these servers over the internet.
> Are they SRMs themselves?
No they are part of the SRM system but SRM its self is a redirecting API
which returns URL's to the data server.
> Pehaps I haven't
> understood what an SRM is. I thought dcache was one of the SRMs, is it
> not?
Dcache provides an SRM API and data servers to support SRM use so I
should say it is.
Owen
>
> cheers
> alessandra
>
> On Tue, 22 Feb 2005, Steve Traylen wrote:
>
> > On Tue, Feb 22, 2005 at 02:14:56PM +0000 or thereabouts, Owen Synge wrote:
> >> On Tue, 2005-02-22 at 14:05 +0000, Alessandra Forti wrote:
> >>> Hi Steve,
> >>>
> >>> as usual we are not talking the same language :) and I need a bit of
> >>> explanation.
> >>>
> >>>> I think everything is correct. Only addition is that the difference between
> >>>> CMS and the data challenge is that CMS do srmcp's where as the service
> >>>> challenge does a (get-turl && get-turl) , 3rd party g-u-c,
> >>>> (close-turl && close-turl). This is why the disk servers them selves
> >>>> must be exposed to internet in the CMS case since it is them that do the
> >>>> transfer for you and they do it non-passivly.
> >>>
> >>> what package does srmcp belong?
> >>
> >> d-cache-client-1.0-34
> >>
> >>> what package do get-turl/3rd party g-u-c/close-turl belong?
> >>
> >> Any Srm client. So probably the experimental code for CMS is my guess in
> >> this case.
> >>
> >>> what does g-u-c mean?
> >>
> >> I am guessing Steve means Globus URL Copy
> >>
> >>> what is the difference between the two?
> >>
> >> srmcp is written in Java, the rest are in C/C++.
> >>
> >> srmcp supports dcap.
> >>
> >> Apart from that, some WSDL passing, and some other trivial stuff not
> >> much from my knowledge, can you add more Steve?
> >
> > Not much, The srmcp supports the SRM cp method where you can ask one
> > SRM to copy a file to another SRM on your behalf thus making the
> > transfer asyrchonous.
> >
> > lcg-rep does a (get-source-turl,get-dest-turl), 3rd party globus-url-copy,
> > (close-source-turl,close-dest-turl) and is sychronous.
> >
> > Steve
> >
> >
> >
> >>
> >> Owen
> >
> > --
> > Steve Traylen
> > [log in to unmask]
> > http://www.gridpp.ac.uk/
> >
>
> --
> ********************************************
> * Dr Alessandra Forti *
> * Technical Coordinator - NorthGrid Tier2 *
> * http://www.hep.man.ac.uk/u/aforti *
> ********************************************
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