2.6.15 does not boot -- who creates RAID devices?

2.6.15 does not boot -- who creates RAID devices?

[Moshe Yudkowsky]

I can't boot 2.6.15; the problem is rather straightforward, but I'd like 
a quick reality check from this list.

In 2.6.14, the device /dev/md/1 is started directly from the /init 
script inside initrd.img using mdadm and UUIDs, using info that it 
garners during LILO.

In 2.6.15, a script in /scripts/local-top/md calls /sbin/mdrun. mdrun 
script explicitly uses mknod to create md devices 0 through 24, and then 
calls mdadm to start these devices if they exist. Unfortunately, through 
an error that I haven't yet uncovered, it starts the components that I 
use for /dev/md/1 as /dev/md/0, my /dev/md/2 as /dev/md/1, etc. In turn, 
this conflicts with /etc/fstab, my file system is never mounted, and the 
boot stalls. (If anyone is interested, the script is part of the 
initramfs tools and can be found, in the Debian distribution, in 
/usr/share/initramfs-tools/scripts/local-top/md.)

Now, as far as I can tell from reading /etc/udev/compat-full.rules, the 
role of udev is strictly post-device creation; it has no role, even in 
theory, of starting these devices; udev just creates a symlink when it 
finds out that some other script creates the md device.

Or am I missing something that udev does? I'm particularly perplexed 
because the "mdrun" script has been around since 2003, and now it's 
suddenly assembling devices in funny way; udev is more in flux. On the 
other hand, 2.6.15 boots in a new way, and I suspect that's the culprit.
-- 
  Moshe Yudkowsky
  work: http://www.Disaggregate.com
  book: http://www.PebbleAndAvalanche.com


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