guau..first, i never think the response about my post, really really thanks all, i am not alone here..:-). ok, i send a second message with the other method than i don´t know if result. first, i am install the redhat 3 AS then i will apply the next sequence: "Import GPG Keys: rpm --import http://mirror.centos.org/centos/3.7/os/i386/RPM-GPG-KEY-CentOS-3 Install yum: rpm -Uvh --nodeps http://mirror.centos.org/centos/3.7/os/i386/RedHat/RPMS/yum-2.0.8-1.centos.7.noarch.rpm http://mirror.centos.org/centos/3.7/os/i386/RedHat/RPMS/centos-yumconf-1-11.noarch.rpm http://mirror.centos.org/centos/3.7/os/i386/RedHat/RPMS/centos-yumcache-3.1-0.20060404.3.noarch.rpm Update Release information: rpm -e redhat-release-3ES-13.6.2 && rpm -ivh http://mirror.centos.org/centos/3.7/os/i386/RedHat/RPMS/centos-release-3-7.1.i386.rpm then just: yum upgrade " then i will hope upgrade to centos 4 :-) if result. in relations to my machine config is: Dell Power edge 2800 ,PROCESSOR, 80546K, 3.0G, 2M, XEON IRWINDALE, 4 scsi disk, 4 ethernet Gigabit. i have the software server assistant and open manage. i install de redhat 3 with the server assistant and configure RAID 5 by hardware (i select raid 5 after of read any docs...i hope my selecction was correct?). thanks all guys and thank to traduce me Guillermo "guau.. que respuesta, estoy emocionado, no estoy acostumbrado a la cooperacion entre pares en mi institucion...gracias" regards, roberto.-