Back end examples

Here are some examples of the "back ends" that could be used by various types of project.

SETI@home with local data servers

• A splitter program generates data files. For each data file, calls the BOINC server library to create a workunit record and several result records, and stores the data file on disk of a data server.
• A garbage collector program deletes data files for which enough results have been returned. Generates new result records as needed.
• A result handler program checks for new results. Parses result files, and transfers contents to a separate "science database". Does redundancy checking, and marks result records as valid or invalid.

SETI@home with remote data servers

As above, but the splitter program writes data files to DLT tape. The result records are generated, using the URL of a selected data server. The tape is mailed to the data server. An operator at the data server transfers the files to disk, than uses a web control panel to mark the batch as ready, which marks the result records as ready.