Red Hat Bugzilla – Bug 427960
Grub + Raid + LVM
Last modified: 2008-01-12 17:16:51 EST
I have installed Fedora Core 8 in a machine with 4 disks each 200 GBytes; sda, sdb, sdc, sdd the partitioning is the following: md0: /boot (Raid-1 (2 disks + 2 spare disks)) md1: / (RAID-6, (4 disks) + LVM) - the LVM has logical volumes: - / for the linux (00) - /home the rest (02) - swap (01) When I now start the server it stops without any GRUB menu coming up, the error message "GRUB hard disk error" is displayed. When I start through the linux rescue it works fine. It reads the hard disk and no problem when I do the chroot /mnt/sysimage What is the problem? It seems that the hard disk ctructure can not be read by GRUB. What to do? Here is the menu.lst : boot=/dev/md0 default=0 timeout=5 splashimage=(hd0,0)/grub/splash.xpm.gz hiddenmenu title Fedora (2.6.23.9-85.fc8) root (hd0,0) kernel /vmlinuz-2.6.23.9-85.fc8 ro root=/dev/VolGroup00/LogVol00 rhgb quiet initrd /initrd-2.6.23.9-85.fc8.img title Fedora (2.6.23.1-42.fc8) root (hd0,0) kernel /vmlinuz-2.6.23.1-42.fc8 ro root=/dev/VolGroup00/LogVol00 rhgb quiet initrd /initrd-2.6.23.1-42.fc8.img Maybe it is possible to first install the RAID and then on top of md1 put the LVM afterwards.....but it wont be possible I guess..... What is the actual problem? Why doesn't it play together? GRUB doesn't find the hard disks. Any solution.....I can not startup! I am stuck here!
I tested to do the following: 1. grub-install /dev/sda1 2. change /dev/md0 in mtab and fstab to /dev/sda1 it did not work, because the /boot could not be found anymore.
Created attachment 291083 [details] Grub-install result
I also tried the following: grub> root (hd0,0) grub> setup --stage2=/boot/grub/stage2 --prefix=/grub (hd0) ... grub> root (hd1,0) grub> setup --stage2=/boot/grub/stage2 --prefix=/grub (hd1) but it does not help! Is there anyone who knows the problem?
Filesystem 1K-blocks Used Available Use% Mounted on /dev/VolGroup00/LogVol00 4062912 2592276 1260924 68% / /dev/VolGroup00/LogVol02 380296124 199472 360466984 1% /home /dev/md0 194366 19289 165042 11% /boot
Personalities : [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] md0 : active raid1 sda1[0] sdc1[2](S) sdd1[3](S) sdb1[1] 200704 blocks [2/2] [UU] md1 : active raid6 sda2[0] sdd2[3] sdc2[2] sdb2[1] 397881344 blocks level 6, 256k chunk, algorithm 2 [4/4] [UUUU]
[root@localhost ~]# tail /etc/fstab /dev/VolGroup00/LogVol00 / ext3 defaults 1 1 /dev/VolGroup00/LogVol02 /home ext3 defaults 1 2 /dev/md0 /boot ext3 defaults 1 2 tmpfs /dev/shm tmpfs defaults 0 0 devpts /dev/pts devpts gid=5,mode=620 0 0 sysfs /sys sysfs defaults 0 0 proc /proc proc defaults 0 0 /dev/VolGroup00/LogVol01 swap swap defaults 0 0
Created attachment 291122 [details] dmesg result
[root@localhost ~]# grub-install --recheck /dev/md0 Probing devices to guess BIOS drives. This may take a long time. Installation finished. No error reported. This is the contents of the device map /boot/grub/device.map. Check if this is correct or not. If any of the lines is incorrect, fix it and re-run the script `grub-install'. (fd0) /dev/fd0 (hd0) /dev/sda (hd1) /dev/sdb (hd2) /dev/sdc (hd3) /dev/sdd
All above have been done in rescue mode after chroot /mnt/sysimage
Now I have been looking into an another machine with FC3. It has grub + raid but not lvm. Boot is /dev/md0 The setup is exactly the same as in the FC8. It works just fine!!!! What is the difference? BIOS problem? No, I don't think so as the machines are exactly the same and have the same BIOS as well as hardware. My conclusion is that something must have happened with GRUB from FC3 -> FC8 I can not use the machine at all because I can only start it in rescue mode. Is there anyone who can help me as this is a critical error. I would be thankful to get some advice.