I have 3 servers. 1'st Apache and Tomcat. On 2 I want to install Jboss and Postgresql. I would like that 3 server have the same configuration that 2. I want to do somethink like a (RAID1) mirror with server 2 and 3. Tomcat communicates with both of them if he want to put some informations to database. He put the same information to jboss on server 2 and 3. If he want some information he communicates with server 2 if for examle 2 server crash he communicates with 3 server. I want to ask if someone did somethink like that or know if it possible and where find some information about this.