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GRIDPP-STORAGE  February 2005

GRIDPP-STORAGE February 2005

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Subject:

Re: Tomorrow's telconf

From:

Steve Traylen <[log in to unmask]>

Reply-To:

Steve Traylen <[log in to unmask]>

Date:

Tue, 22 Feb 2005 15:42:49 +0000

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (159 lines)

Is any one else getting two copies of all the mails posted to this
list?

 Steve

On Tue, Feb 22, 2005 at 03:33:07PM +0000 or thereabouts, Owen Synge wrote:
> On Tue, 2005-02-22 at 15:24 +0000, Steve Traylen wrote:
> > On Tue, Feb 22, 2005 at 03:00:20PM +0000 or thereabouts, Owen Synge wrote:
> > > On Tue, 2005-02-22 at 14:55 +0000, Alessandra Forti wrote:
> > > > > Because data is transfered to and from these servers over the internet.
> > > >
> > > > So it skips head node and gridftp servers second layer (in the tier1
> > > > architecture) as explained by Andrew few mails ago?
> > >
> > > The process is as follows,
> > >
> > > {A} Client contacts server and asks where to put the data
> > > {B} Client Receive a "Transfer" URL which is where to place the data
> > > {C} Client uploads the data to URL.
> >
> > Though in the case of SRM copy method is it?
> >
> >  {A} Client contacts 1st SRM and asks it to transfer file to another 2nd SRM
> >  {B} 1st SRM asks 2nd SRM where to put the file.
> >  {C} 1st SRM tells backend dcache nodes to put the file where the 2nd SRM
> >      told it to put it.
> >
> >  Steve
>
> I think so, although other variations are possible.
>
> push or pull mode essentially, in general it does not matter and both
> should be supported if you listed to anyone but Peter K. who does not
> think SRM third party copies are a good thing. (dependency graphs etc
> but I suspect politics.) I don't think SRM 3rd Party copy is required
> functionality, but I could easily be up to date.
>
> Regards
>
> Owen
>
>
>
>
> >
> >
> > >
> > > Regards
> > >
> > > Owen
> > >
> > >
> > > > On Tue, 22 Feb 2005, Owen Synge wrote:
> > > >
> > > > > 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?
> > > > >
> > > > >
> > > > >> 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        *
> > > > >> ********************************************
> > > > >
> > > >
> > > > --
> > > > ********************************************
> > > > * Dr Alessandra Forti                      *
> > > > * Technical Coordinator - NorthGrid Tier2  *
> > > > * http://www.hep.man.ac.uk/u/aforti        *
> > > > ********************************************
> >
> > --
> > Steve Traylen
> > [log in to unmask]
> > http://www.gridpp.ac.uk/

--
Steve Traylen
[log in to unmask]
http://www.gridpp.ac.uk/

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