[Go-essp-tech] DRS hierarchy on disk

[philip.kershaw at stfc.ac.uk]

This is a problem for something like GridFTP where you 'see' the file system on the server not the DRS hierarchy.  It's a headache for applying security policy as presumably this is based on the DRS structure.  Some kind of mapping would need to be maintained.   
 
Is there a way of altering the GridFTP server side interface so that it could see a virtual file system structure based on the DRS?
 
Cheers,
Phil

	-----Original Message-----
	From: go-essp-tech-bounces at ucar.edu [mailto:go-essp-tech-bounces at ucar.edu] On Behalf Of Dean N. Williams
	Sent: 19 November 2009 12:14
	To: Lawrence, Bryan (STFC,RAL,SSTD)
	Cc: go-essp-tech at ucar.edu
	Subject: Re: [Go-essp-tech] DRS hierarchy on disk
	
	
	This is a correct statement. 

	-Dean

	On Nov 19, 2009, at 4:04 AM, <bryan.lawrence at stfc.ac.uk> wrote:


		
		Hi Stephen
		
		Bob or someone else can confirm, but  I think the issue is that ESG in general is aiming at supporting more than just the DRS, so while conforming to DRS is a given for CMIP5, it’s not a given for all the datasets that ESG may work with.
		
		Bryan
		
		
________________________________

		From: go-essp-tech-bounces at ucar.edu [mailto:go-essp-tech-bounces at ucar.edu] On Behalf Of stephen.pascoe at stfc.ac.uk
		Sent: 19 November 2009 11:49
		To: drach at llnl.gov
		Cc: go-essp-tech at ucar.edu
		Subject: [Go-essp-tech] DRS hierarchy on disk
		
		At the telco this Tuesday I was slightly surprised when someone (I think Bob) asserted data is not likely to follow the DRS hierarchy on disk.  Although we know the disk layout can be mapped to DRS URLs in the web server I thought our default position was that we would lay out the data in the DRS hierarchy because it is the simplest solution.
		
		This issue came up in a meeting with UKMO yesterday where they thought there was a strong reason for using the DRS on disk so that fallback positions like ftp follow a consistent structure.  I also learnt that CMOR2 will output to the DRS hierarchy automatically.
		
		Given this, why wouldn't we want to insist all datasets are stored on disk in the DRS hierarchy?
		
		Thanks,
		Stephen.
		
		---
		Stephen Pascoe  +44 (0)1235 445980
		British Atmospheric Data Centre
		Rutherford Appleton Laboratory
		
		

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