grub failure to update MBR (using RAID and LVM)
Paul Pianta
pantz at lqt.ca
Thu Feb 17 22:22:55 UTC 2005
On Thu, 2005-02-17 at 14:46 -0500, Shawn Iverson wrote:
> Greetings again,
>
> I have yet another issue with my server. I cannot update my GRUB menu.
> I have a RAID 1 set up as follows on FC3 with latest official updates:
>
> /dev/hda, /dev/hdb, and /dev/hdc, with hda and hdb containing two
> mirrors and /dev/hdc as a hot spare.
> /dev/md0 is /boot with 1GB of space on and ext3 filesystem
> /dev/md1 is a linux LVM with a separate logical volume for each major
> mount point (/usr, /var, /, /home, etc.) using ext3 on a single volume
> group.
>
> My BIOS settings are set to boot in this order: IDE0, IDE1, IDE2. I
> isolated the boot to IDE0 for the sake of troubleshooting this, though.
> Boot other devices is disabled.
>
> Instead of getting the menu with the three choices, I still see my older
> menu containing only the two older kernels after rebooting. I never had
> this much trouble with a boot loader before, and I am even considering
> switching it over to LILO because it seems to handle software RAID so
> much better, that is, if I cannot resolve this issue.
Hey Shawn
I have run into this problem b4 too. Check out 'Step 25' at this
link ...
http://togami.com/~warren/guides/remoteraidcrazies/
You can also verify if grub is 'really' installed on your disks by doing
a 'dd if=/dev/hda bs=512 count=1' on each disk.
If grub is really installed you should see something like this -
---snip---
[root at trinity root]# dd if=/dev/hda bs=512 count=1
�м؎�|�8u
�u�|tAʀ�|1؎м @|<t�y}�tTAU�ZRrIUuCA|��t7fL|�fD|��f�pf1 DfD
B�rp�s
�|�f at fD1���@��ffD|f1�4T
f1�tT
D
�L ;}<T
�ъl
Zt
p�۸�r*ÎH|`�1a&B|}��}��}�}��GRUB GeomHard DiskRead Error�<u��v?
?/
�~}
KK4�LL#/-U1+0 records in
1+0 records out
---snip---
Don't worry about the diskread error message - its ok - it means that
grub is installed there. If grub is not installed you will see something
like this ...
---snip---
[root at trinity root]# dd if=/dev/hdc bs=512 count=1
м؎�|�8u
�u�|tL��|�?
?/
�~}
KK4�LL#/-U1+0 records in
1+0 records out
---snip---
It's a really annoying 'bug' with anaconda? that grub is not written to
all disks when a RAID setup is configured during installation ...
Hope that helps :)
pantz
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