On 7/23/2010 9:00 AM, Joseph L. Casale wrote:

...

Try something like this:

Grub>device (hd0) /dev/sdb Grub>root (hd0,0) Grub>setup (hd0)

His syntax shows the installation from within a grub prompt which is right, Yours looks more like what you use with grub-install. Regardless, his approach is how my kickstart has been doing it for years with success...

I think there may be differences in controllers and possibly in failure modes as to whether the 2nd drive becomes seen as the first when the first one fails. But I'm not sure how to know this ahead of time or the right syntax to use for each case. And while the md devices will still build out of the right pieces when they autodetect, you may also need to adjust anything that uses the /dev/sd? names to account for them shifting (or not) and be aware of it in any manual setup commands like using mdadm to force partitions to be added if they didn't come up automatically.

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@greenspot.fi * http://www.greenspot.fi _______________________________________________ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos