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The XrdCeph plugin is a Storage level plugin implementing an API in the spirit of the POSIX filesystem abstraction [ref]. XrdCeph relies on libradosstriper to split up write data into RADOS objects, and to re-assemble read data from RADOS objects.
When Echo was being built it was noted that as an object store it was better suited to streaming entire objects rather than performing many small reads (AKA Vector reads) on it. It was therefore decided to place XCaches infront of all the storage endpoints.
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