i change the 2 disks, and i have installed ubuntu server 10.04.2, and build the raid with the installer, and all work ok. The 2 disks can boot. In other hand this is a new system and i need to use the other system. Any way this server is a mysql server, so i have installed only installesd apache, mysql, phpmyadmin, openssh, and nothing more. So i can backup the mysql bases, and used in the new system, but i have a problem that maybe the correct will be open other thread, and i will, but the problem is the following: The old system have the same packages installed, and at boot its consume 120 mb of ram, and the new one 230mb of ram, why i can happend?