[CentOS] install on raid1

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
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