Hi All, I'm currently trying to install centos 5.4 x86-64bit on a raid 1, so if one the 2 disks fails the server will still be available. i installed grub on /dev/sda using the advanced grub configuration option during the install. after the install is done i boot in linux rescue mode , chroot the filesystem and copy grub to both drives using: grub>root (hd0,0) grub>setup (hd0) grub>root (hd1,0 grub>setup (hd1) grub>quit then reboot, but is still get the error : disk boot faillure, insert linux install disk. does anyone now what i'm doing wrong? here is a copy of my partition scheme. Disk /dev/sda: 251.0 GB, 251000193024 bytes 255 heads, 63 sectors/track, 30515 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sda1 * 1 38 305203+ fd Linux raid autodetect /dev/sda2 39 675 5116702+ fd Linux raid autodetect /dev/sda3 676 30515 239689800 fd Linux raid autodetect Disk /dev/sdb: 251.0 GB, 251000193024 bytes 255 heads, 63 sectors/track, 30515 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sdb1 * 1 38 305203+ fd Linux raid autodetect /dev/sdb2 39 675 5116702+ fd Linux raid autodetect /dev/sdb3 676 30515 239689800 fd Linux raid autodetect Disk /dev/md1: 5239 MB, 5239406592 bytes 2 heads, 4 sectors/track, 1279152 cylinders Units = cylinders of 8 * 512 = 4096 bytes Disk /dev/md0: 312 MB, 312410112 bytes 2 heads, 4 sectors/track, 76272 cylinders Units = cylinders of 8 * 512 = 4096 bytes Disk /dev/md2: 245.4 GB, 245442281472 bytes 2 heads, 4 sectors/track, 59922432 cylinders Units = cylinders of 8 * 512 = 4096 bytes Regards, Wessel -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos/attachments/20100723/d682cdc9/attachment-0004.html>