Udev and SCSI partitions not mounted

Question

I have just attempted to convert devfs to udev on my dual AMD Opteron with two SCSI drives running fully up-to-date Arch Linux.  The result of following the standard udev procedure (which has worked on three other IDE machines without a hitch) was that of the four mountable SCSI disk partititions, only swap and / were mounted properly
/dev/discs/disc0/part1 / reiserfs defaults 0 0
dev/discs/disc0/part2 swap swap defaults 0 0
while the /home and /data partitions were not recognized and mounted:
/dev/discs/disc0/part3 /home reiserfs defaults 0 0
/dev/discs/disc1/part1 /data reiserfs defaults 0 0
I was able to revert the machine back to its original devfs so the machine does work properly in its original configuration.
I noticed a bash script in the /etc/udev directory that seemed to be used to identify the SCSI devices present. Is it possible that this is not working correctly?  Does anyone have any idea of how the SCSI configuration could have gone awry?
Thanks.
Some details about the machine:
arch version: Arch Linux 0.7 (Wombat)
kernel version: 2.6.7
two processors: AMD Athlon(tm) MP 2600+
two SCSI_storage_controllers: Adaptec AIC-7899P U160/m (rev 1).

Answer 1

Once again, I installed archlinux on an scsi machine, and have been cought in the boot-scsi-device-fails-udev-trap. This time, I had a bit of time. Instead of editing the fstab entries, I decided to find out why ide devices are handled well, and scsi devices are not.
Have a look at udev.rules. You will find an entry for ide block deviced there, that creates devfs symlinks:
# ide block devices
BUS="ide", KERNEL="hd*", PROGRAM="/etc/udev/ide-devfs.sh %k %b %n", NAME="%k", SYMLINK="%c{1} %c{2}"
You will notice also there are no similar entries for scsi block devices. Therefore, their nodes will not fit devfs scheme. Now, let's have a look at /etc/udev/. You will find scsi-devfs.sh there. This script will create devfs-like nodes for scsi blocks. Now the problem is clear, isn't it. Add the following lines to udev.rules:
# scsi block devices
BUS="scsi", KERNEL="sd*", PROGRAM="/etc/udev/scsi-devfs.sh sd %b %n", NAME="%c{1}", SYMLINK="%c{2} %k %c{3} %c{4}"
BUS="scsi", KERNEL="sr*", PROGRAM="/etc/udev/scsi-devfs.sh sr %b %n", NAME="%c{1}", SYMLINK="%c{2} %k %c{3} %c{4}"
BUS="scsi", KERNEL="st*", PROGRAM="/etc/udev/scsi-devfs.sh st %b %n", NAME="%c{1}", SYMLINK="%c{2} %k %c{3} %c{4}"
BUS="scsi", KERNEL="sg*", PROGRAM="/etc/udev/scsi-devfs.sh sg %b %n", NAME="%c{1}", SYMLINK="%c{2} %k %c{3} %c{4}"
Now the devfs naming scheme should be used for scsi devices, too. Surprisingly, it isn't. Any hints are welcome.