thnx for the response guys Apparently the problem lies with the bios not detecting both sata dirives early enough in its boot process. so i patched both drives to another port on the motherboard and now it works like a charm. but i'm not sure what i've to add to the grub.conf? wessel On Jul 23, 2010, at 4:01 PM, Jussi Hirvi wrote: > I don't have a direct answer to your question, but here is the howto I > have been using twice, with good results: > > http://www.howtoforge.com/software-raid1-grub-boot-fedora-8 > > After installing grub to the other disk, did you update your grub.conf > accordingly? > > Terv. > Jussi > > On 23.7.2010 11.12, Wessel | Postoffice wrote: >> 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 > > > -- > Jussi Hirvi * Green Spot > Topeliuksenkatu 15 C * 00250 Helsinki * Finland > Tel. +358 9 493 981 * Mobile +358 40 771 2098 (only sms) > jussi.hirvi at greenspot.fi * http://www.greenspot.fi > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos/attachments/20100725/86d018e2/attachment-0005.html>