[gentoo-user] udev Migration and SCSI

[Ian Brandt <ian@ianbrandt.com>]

Hi,

I'm trying to remotely upgrade my server from
gentoo-sources-2.4.25_pre7-r2 to gentoo-sources-2.6.13-r9, i.e. from
devfs to udev.  My root partition is on a RAID 1 mirror on an Adaptec
2100S.  My existing fstab is below.  It was summarized to me by the
NOC over the phone, so I don't have the exact text of the startup
error, but it is something to the effect of...

/dev/scsi/host0/bus0/target0/lun0/part3 not found

I'm guessing that udev is tweaking the naming scheme a bit, as warned
under "No Consistent Naming between DevFS and udev" in the Gentoo udev
Guide.

So two questions:

1) How can I tell what the new name is going to be?

2) As I'm doing this upgrade remotely, how can I set up to fail back
to my udev-less 2.4.25 kernel should 2.6.13 still fail to come up?  In
other words, if I change fstab to be udev specific won't that leave me
dead in the water?

Thanks!

Ian

# /etc/fstab: static file system information.
# $Header: /home/cvsroot/gentoo-src/rc-scripts/etc/fstab,v 1.14
2003/10/13 20:03:38 azarah Exp $
#
# noatime turns off atimes for increased performance (atimes normally
aren't
# needed; notail increases performance of ReiserFS (at the expense of
storage
# efficiency).  It's safe to drop the noatime options if you want and to
# switch between notail and tail freely.

# <fs>                  <mountpoint>    <type>          <opts>
          <dump/pass>

# NOTE: If your BOOT partition is ReiserFS, add the notail option to opts.
/dev/scsi/host0/bus0/target0/lun0/part1         /boot           ext3
          noauto,noatime          1 2
/dev/scsi/host0/bus0/target0/lun0/part3         /
reiserfs        noatime                 0 1
/dev/scsi/host0/bus0/target0/lun0/part2         none            swap
          sw                      0 0
/dev/cdroms/cdrom0      /mnt/cdrom      iso9660         noauto,ro
          0 0
#/dev/fd0               /mnt/floppy     auto            noauto
          0 0

# NOTE: The next line is critical for boot!
none                    /proc           proc            defaults
          0 0

# glibc 2.2 and above expects tmpfs to be mounted at /dev/shm for
# POSIX shared memory (shm_open, shm_unlink).
# (tmpfs is a dynamically expandable/shrinkable ramdisk, and will
#  use almost no memory if not populated with files)
# Adding the following line to /etc/fstab should take care of this:

none                    /dev/shm        tmpfs           defaults
          0 0

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