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+===== Fault Tolerance =====
+We would like to make OAR fault tolerant. For implanting such a solution, two nerve centers have to be taken in account and be reinforced:
+  *  the database
+  *  the OAR server
+One part of the solution could be to set a monitoring system between the OAR server and an other spare server (by heartbeat system or any other watch method, see "this page":http://www.linuxvirtualserver.org ).
+For the database fault tolerance, replication mono master / mono slave seems to be a good solution in our context (see "MySQL replication":http://dev.mysql.com/doc/refman/5.0/en/replication.html and "PostGres replication":http://slony.info ).
+The system has to work with both Postgres and Mysql databases. However this solution is not necessary the best regarding the overload if the database is much solicited.
+The work of the intern will be to set benchmarks to test if database (Postgres and Mysql) replication is acceptable and to suggest other solutions.
+At the end of this study, the intern will have to choose and implement a solution for both server and database fault tolerance.
+The intern will be in constant relation with the team and will regularly discuss the work progression by audioconference and by mail.
+===== Classification =====
+Medium
+===== Intern required skills =====
+  *  Perl
+  *  Fault tolerance on Linux servers
+  *  Databases: Postgres, Mysql
+  *  Linux
+===== Mentors =====
+  *  Joseph Emeras
+  *  Bruno Bzeznik