software raid boot failure

[Sam Azer]

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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