/dev/raw/raw* permission change to root:disk,when reboot (10g R2 RAC on Linux - RH4 )

This is a feature of RHEL4.0. The rawdevice files under /dev/raw are created each time the systems boot, unlike RHEL3.0.
Correct way of fixing this is on RH4 to create /etc/udev/permission.d/40-udev.permissions. You can do this by copying /etc/udev/permission.d/50-udev.permissions, and removing the lines that are not needed (50-udev.permissions gets replaced with upgrades so you do not want to edit it directly) e.g.
# raw devices
raw/raw1:root:oninstall:0660
raw/raw2:oracle:oninstall:0660