[ale] SW RAID install problem - can't find root on raid at boot time

[Christopher Fowler]

Are the partition types 'fd' ?  "Raid Auto-detect"?


On Tue, 2006-08-29 at 09:46 -0400, Jeff Hubbs wrote:
> Having all manner of trouble with this.
> 
> Two SATA drives; onboard RAID disabled in favor of SW RAID:
> 
>   ptn |   1   |   2   |   3   |
>  disk ------------------------
>   sda | /boot |  md1  |  md2  |
>   sdb | spare |  md1  |  md2  |
> 
> The goal here is to mount /dev/md1 at boot.
> 
> At boot, I get:
> 
>   md: autodetecting raid arrays
>   md: autorun...
>   md: ...autorun done
>   VFS: cannot open root device "md1" or unknown-device(0,0)
>   please append a correct "root=" boot option
>   Kernel panic - not syncing: vfs : unable to mount root fs on
> unknown-block(0,0)
> 
> I have been using http://tinyurl.com/mauwd for guidance.  I am not now
> dealing with LVM (that will involve /dev/md2, after I get this machine
> booting on its own.
> 
> Let me try to cover the more obvious things:
>   * SATA, the SATA chipset in question, device mapper support, and RAID
> 1 are all compiled into the kernel.
>   * /etc/mdadm.conf looks like
> 
>         DEVICE /dev/sd[ab][23]
>         ARRAY /dev/md2 level=raid1 num-devices=2
> UUID=833313e0:55a9f505:b67e7c38:af37019a
>         ARRAY /dev/md1 level=raid1 num-devices=2
> UUID=b67bd189:933757ef:ef6dff61:50ad811a
> 
>     (Note: the two ARRAY lines were generated with mdadm --detail --scan
> when booted to a livecd with
>      the RAID volumes up and running)
>   * /dev/sd[ab][23] are all of partition type fd.
>   * /dev/md1 and /dev/md2 are fundamentally sound; I can boot to a
> LiveCD, modprobe raid1,
>     mdadm --assemble, and mount them right up with no problem.
> 
> I made a point of not being module-dependent at boot.  I have no initrd,
> and the doc I linked to above likewise has no initrd. 
> 
> Anything here I've missed?
> 
> - Jeff
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