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Key differences between Fedora 6 and earlier versions 

While the user facing API has not changed significantly from Fedora 5 to Fedora 6,  the internal storage and indexing  of  data in Fedora 6  is a complete rewrite of earlier version.   That being the case there are important implications of which you should be aware.

Writes of RDF to the repository will be slower in some cases

In Fedora 5 and earlier,  RDF resources as well as small (sub 10K) binary files were stored directly in the database rather than being written to disk.  In Fedora 6 all RDF resources are stored on disk in OCFL.  If you're writing to  a local SSD storage you may not notice a significant decrease in performance.  However if you are using NAS (Network Attached Storage) you may observe slower performance than Fedora 5.   In order to support the data preservation sensibilities offered by OCFL - namely a transparent on disk representation of the repository -  Fedora 6 must write all persistent resources to disk regardless their size and/or function. 

 

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