How to create RAW Partions on linux (to be used for ASM and RAC)

First create the HDD Partitions , ensure that you have 3 partions
say /dev/sdb1 , /dev/sdc1 and /dev/sdd1

run the command fdisk -l and verifiy them

1. Edit the /etc/sysconfig/rawdevices file, and add the following lines.

/dev/raw/raw1 /dev/sdb1
/dev/raw/raw2 /dev/sdc1
/dev/raw/raw3 /dev/sdd1

2. service rawdevices restart

3. raw -qa

4. Create the softlinks for the files

ln -s /dev/raw/raw1 /u01/oradata/ocr
ln -s /dev/raw/raw2 /u01/oradata/votingdisk
ln -s /dev/raw/raw3 /u01/oradata/asm1

5. Add the following lines in the "/etc/rc.local" file.

chown oracle:oinstall /dev/raw/raw1
chown oracle:oinstall /dev/raw/raw2
chown oracle:oinstall /dev/raw/raw3
chmod 600 /dev/raw/raw1
chmod 600 /dev/raw/raw2
chmod 600 /dev/raw/raw3