Edit /etc/rc.d/rc.local 

# and insert the following lines at the end

# OCR Disks
chown root:oinstall /dev/mapper/ocr*
chmod 640 /dev/mapper/ocr*
# Voting Disks
chown oracle:oinstall /dev/mapper/vot*
chmod 660 /dev/mapper/vot*
# ASM Disks
chown oracle:oinstall /dev/mapper/asm*
chmod 660 /dev/mapper/asm*