Thank you very much for your help. Your control panel is beautiful...
I install it on 6 servers with each one 3*2000 go on raid 5,with debian 6.0 and glusterfs for replication. Each pool is hosting webserver,mysqlserver and mail server. The replication is working fine. I'm going to add th dns server on 3 VPS ( each VPS are on differents servers
Again thank you for your informations.