software raid boot failure

[Heinz Mauelshagen]

Sam,

your MD component can't be discovered.
The driver for those is probably missing in the kernel.
The LVM issue is just a followup, presumably the LVM metadata
is sane on the MD device, once it can be assembled.

Regards,
Heinz    -- The LVM Guy --


On Wed, Jul 11, 2007 at 11:18:13PM -0400, Sam Azer wrote:
> Hi Folks,
>  
> I'm wondering if somebody can point me in the right direction:
>  
> A problem occurs very early in the boot process on a Fedora 7 system: mdadm
> can't find the devices needed to assemble /dev/md1 which contains an LVM
> volume group. The specific problem appears to be the "mdadm: no devices
> found," which is followed by a few related problems and ends with a Kernel
> Panic:
>  
> ...
> Red Hat nash 6.0.9 starting
> insmod: error inserting '/lib/raid456.ko': -1 File exists
> mdadm: no devices found for /dev/md1
>    Reading all physical volumes. This may take a while...
>    No volume groups found
>    Volume group "vg0" not found
> Unable to access resume device (/dev/vg0/lv0)
> ...
>  
> (The system used to work fine even though the raid456.ko message always
> appeared.)
>  
> The system was working fine up to last night when I think the temperature
> rose too high and it crashed. The funny thing is that if I boot the F7 DVD
> in rescue mode the system image is discovered and mounted without any
> trouble.
>  
> I may have messed things up at some point by booting the F7 rescue mode and
> executing
>  
> # grub-install /dev/sda1 
>  
> when I should have used
>  
> # grub-install /dev/sda
>  
> I'd really appreciate it if somebody could point me to some documentation on
> this stage of the boot process (mounting raid/lvm file systems.)
>  
> I'd also appreciate any help understanding why mdadm can't figure out what
> devices to use for an array - there must be a way to fix that. The way the
> system is now, I need to create an mdadm.conf file before the --assemble
> command will work (isn't mdadm supposed to be able to figure out what
> devices to use without the conf file?) Perhaps there's a solution hiding in
> that direction.
>  
> Thanks very much,
> All the best,
> Sam.
>  
>  

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*** Software bugs are stupid.
    Nevertheless it needs not so stupid people to solve them ***

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Heinz Mauelshagen                                 Red Hat GmbH
Consulting Development Engineer                   Am Sonnenhang 11
Storage Development                               56242 Marienrachdorf
                                                  Germany
Mauelshagen at RedHat.com                            PHONE +49  171 7803392
                                                  FAX   +49 2626 924446
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