The following terms are used extensively in grid data management issues and guides. Links are given to glossary entries in the GridPP wiki.
| Term | Definition |
|---|---|
| alias | Another term for Logical File Name |
| File Catalog | The file catalog is the grid middleware server which maps LFNs to SURLs, i.e., tracks the real physical locations of the logical file names. |
| GUID | "Globally Unique Identifier" or "Grid Unique Identifier". The file catalog assigns this unique name to files on the grid, making the appropriate mappings to LFNs and SURLs. |
| LFN | "Logical File Name" A user friendly (and user defined) name of a grid file. There can be several LFNs (aliases) for one file. |
| Replica | A copy of a file on the grid (even a single copy of a file can be called a "replica"). |
| SFN | "Storage File Name" - another term for SURL. |
| SURL | "Storage URL". A Storage URL, pointing to the physical stored version of a file on a grid storage element. |
| TURL | "Transport URL" (or Transfer URL). A URL that a storage element issues for a SURL which can be used to retrieve or store data. |
The diagram below displays the relationship between the various entities defined above.
Last modified Thu 5 January 2006 . View page history
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