[gin-data] progress...

[Dave Berry]

Arie,

Thanks for your reply. 

I don't understand your final comment.  I think of a schema as a view on
(meta)data that is already there.  As SRM already provides the
functionality to provide the necessary information, the schema could
even be populated via the existing interface.  Was the problem that the
schema definition kept changing?  

I can see that if you tried to maintain a separate metadata catalog in
addition to the information already stored within SRM itself, that could
be problematic.  But that is a problem of storing copies of the metadata
rather than of describing it.

I suspect I'm not understanding something here.

Best wishes,

Dave.

> -----Original Message-----
> From: Arie Shoshani [mailto:shoshani at lbl.gov] 
> Sent: 25 July 2006 19:58
> To: Dave Berry
> Cc: Erwin Laure; gin-data at ggf.org; Reagan Moore; 
> asim at lbl.gov; Gregor von Laszewski
> Subject: Re: [gin-data] progress...
> 
> Dave,
> 
> SRMs maintain metadata information about Files and spaces (acquired 
> through space reservation functions).  The metadata includes 
> information 
> about file properties (creation time, etc.), the directories they are 
> organized into, and the spaces they were assigned to.  All this 
> information is made available through metadata functions: 
> specifically 
> srmLs, and srmGetSpaceMetadata.
> 
> It is an easy exercise to describe this information using some schema 
> mechanism,
> like relational schemas or XML DTD.  There was an early attempt to do 
> that with the
> GLUE schema, but eventually it was too much detail (for millions of 
> files) to keep
> such as schema instances updated, so this idea was abandoned.
> 
> Arie and Alex
> 
> 
> Dave Berry wrote:
> > Hi,
> >
> > In the OGSA Data WG, we think there is a need for a short 
> standard for
> > file metadata, covering the usual "stat" properties such as creation
> > time, modification time, read-only, etc.  Is this group looking at
> > mapping these properties between systems, or at a common 
> metadata model,
> > or any other way of tackling this issue?
> >
> > Best wishes,
> >
> > Dave.
> >
> >   
> >> -----Original Message-----
> >> From: owner-gin-data at ggf.org [mailto:owner-gin-data at ggf.org] 
> >> On Behalf Of Erwin Laure
> >> Sent: 25 July 2006 10:39
> >> To: gin-data at ggf.org; Reagan Moore; asim at lbl.gov; Gregor 
> von Laszewski
> >> Subject: [gin-data] progress...
> >>
> >> Hi,
> >>
> >> GGF18 is coming up soon. Could we please get an update on 
> the interop 
> >> tests of SRB, SRM, and gridFTP?
> >>
> >> We will use this information to make an interop matrix 
> >> available on the 
> >> GIN gridforge pages.
> >>
> >> Also, we should prepare instructions of how people can run 
> >> these tests 
> >> themselves, i.e. test, whether their infrastructure is 
> interoperable 
> >> with others.
> >>
> >> Cheers,
> >>
> >> -- Erwin
> >>
> >>
> >>     
> 
>