This note is about the setup of /etc/udev/permissions.d/49-oracle-permissions file.  This is how I set up this file on PRET:

db01.pret():/etc/udev/permissions.d >

# ASM
raw/raw[6-9]:oracle:oinstall:0660
raw/raw10:oracle:oinstall:0660
# OCR
raw/raw[12]:oracle:oinstall:0660
# Voting
raw/raw[3-5]:oracle:oinstall:0660

Here are the raw device mappings in directory /dev/raw  (also PRET)

crw-rw----  1 root   oinstall 162, 1 Feb 28 03:21 raw1
crw-rw----  1 root   oinstall 162, 2 Feb 28 03:21 raw2
crw-rw----  1 oracle oinstall 162, 3 Feb 28 03:21 raw3
crw-rw----  1 oracle oinstall 162, 4 Feb 28 03:21 raw4
crw-rw----  1 oracle oinstall 162, 5 Feb 28 03:21 raw5
crw-rw----  1 oracle oinstall 162, 6 Feb 28 03:21 raw6
lrwxrwxrwx  1 root   root         13 Feb 28 03:21 ocr01.dat -> /dev/raw/raw1
lrwxrwxrwx  1 root   root         13 Feb 28 03:21 ocr02.dat -> /dev/raw/raw2
lrwxrwxrwx  1 root   root         13 Feb 28 03:21 css01.dat -> /dev/raw/raw3
lrwxrwxrwx  1 root   root         13 Feb 28 03:21 css02.dat -> /dev/raw/raw4
lrwxrwxrwx  1 root   root         13 Feb 28 03:21 spfile+ASM.ora -> /dev/raw/raw5

Settings in /etc/rc.local

db01.pret():/dev/raw > more /etc/rc.local
#!/bin/sh
#
# This script will be executed *after* all the other init scripts.
# You can put your own initialization stuff in here if you don't
# want to do the full Sys V style init stuff.

touch /var/lock/subsys/local
/sbin/modprobe hangcheck-timer

#ln -s /dev/raw/raw5 /dev/raw/css03.dat
#ln -s /dev/raw/raw10 /dev/raw/spfile+ASM.ora

ln -s /dev/raw/raw1 /dev/raw/ocr01.dat
ln -s /dev/raw/raw2 /dev/raw/ocr02.dat
ln -s /dev/raw/raw3 /dev/raw/css01.dat
ln -s /dev/raw/raw4 /dev/raw/css02.dat
ln -s /dev/raw/raw5 /dev/raw/spfile+ASM.ora
#ln -s /dev/raw/raw6 /dev/raw/spfile+ASM.ora

chown root:oinstall /dev/raw/raw[1-2]
chown oracle:oinstall /dev/raw/raw[3-6]