Bug#610202: grub fails to boot from degraded RAID5 array, "Error: file not found."

[Vladimir 'φ-coder/phcoder' Serbinenko]

On 01/16/2011 05:46 AM, Jesse Molina wrote:
> Package: grub
> Severity: normal
>
>
> Hi.  This might be a wishlist item since I don't know what the
> official status is on raid5 support.  At the very least this is
> an FYI to other users.
>
> I wanted to test out the worthiness of raid5 support with grub
> since I had heard that it had been added awhile back.
>
> I tested with three 80GB SATA disks on the current netinst testing
> installer image as of this date.  FYI, grub-installer was run
> against /dev/sd[a-c] and /dev/md0, just to be sure.
>
> raid5 booting works great under normal conditions.
>
> However, when any one of the three disks is removed, the system
> no longer boots. I did test the removal of all three induvidually.
> Upon re-insertion of all three disks, the system boots normally.
>
> Grub loads it's boot loader and then fails with "Error: file not found."
> and gives a "grub recovery>" or similar prompt.
>
>   
There isn't enough information in this bugreport to see what the problem
is. A similar bug was recently fixed upstream. Could you try 1.99~rc1?
Also we would need information about your RAID, partition layout and a
run of sh -x grub-install
> This would render a system unbootable, should any one of the drives fail
> and perhaps it was not noticed by the sysadmin or a failure occurs during
> normal cold-boot maintenance.
>
> I don't know what the technical challenges are, but hopefully this can 
> be fixed some day.  Being able to boot from a raid5 mdadm array is
> really really cool.
>
>
> -- System Information:
> Debian Release: 6.0
>   APT prefers testing
>   APT policy: (500, 'testing')
> Architecture: amd64 (x86_64)
>
> Kernel: Linux 2.6.32-5-amd64 (SMP w/2 CPU cores)
> Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
> Shell: /bin/sh linked to /bin/dash
>
>
>
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>
>   


-- 
Regards
Vladimir 'φ-coder/phcoder' Serbinenko


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