Data Management Middleware Stack

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Looking at Data Management as a service stack it can be broken down into:

Data Management Middleware Stack
Component LFN SURL Comment
File Catalog Yes Yes Only valid data should get here.
File Placement Service Yes Yes Can manipulate catalogs, invoke FTS.
File Transfer Service No Yes Holds lower level channel information. Invokes low level copies to actually schedule data transfers.
Low level transfer No Yes Usually Grid FTP. Can fail disgracefully.

The middleware above Data Management would be Metadata catalogs and experiment interfaces. Beneath the data management layers lie Grid Storage middleware.