Thanks for clarifying that information, John. I assumed that the Tomcat clustering was only for failover for the TAC. Are you guys using an SVN server or a database for storing your projects? How are you guys backing up your SVN or project database. Are you using VCS, raid, DRBD or just simply exporting the projects to a removable storage? As far as Talend jobs are concerned when the execution servers are processing the jobs are the data stored in memory or does it process it row by row from the query (input data extraction). I need to make sure that the application servers are not doing all the work but rather the execution servers do the work such as joins, transformations, processing, etc.