[rhelv6-list] devices not being made following upgrade to to RHEL 6

[francis picabia]

I did a couple of upgrades from DVD to a Redhat 4
system to bring it up to 6.3.  It runs on software MD
raid.

On boot, it fails to mount anything other than the root
raid /dev/md0 because the devices for md1 through md4
are missing in /dev.  If I manually recreate them from
MAKEDEV I can fsck and mount md1 through md4 fine
under the maintenance mode.

I thought perhaps MAKEDEV could create the whole /dev
tree, but it doesn't.  If udev is the way to do this now,
how do I get it to populate /dev. There might be an earlier
error happening from whatever process which does this,
but if I can try it by hand, I might see what it is.

I notice healthy systems have a udevd -d running.
If I try this manually in maintenance mode,
I get back:

udevd[714]: error getting socket: Invalid argument