Creating Raw disks for ASM (ORACLE ASM)

What is Oracle ASM?

Automatic Storage Management (ASM) is a feature provided by Oracle Corporation within the Oracle Database from release Oracle 10g (revision 1) onwards. ASM aims to simplify the management of database files. To do so, it provides tools to manage file systems and volumes directly inside the database, allowing database administrators (DBAs) to control volumes and disks with familiar SQL statements in standard Oracle environments

Automatic Storage Management (ASM) simplifies administration of Oracle-related files by allowing the administrator to reference disk groups (rather than individual disks and files) which ASM manages.

The ASM functionality is controlled by an ASM instance. This is not a full database instance, just the memory structures and as such is very small and lightweight.

Steps to create raw disks

I am Creating Raw disks using vmware workstation. Check below picture, how to create raw devices
Now you created One disk
Now create three more disks in the same way as shown in figure
2. Now Power on virtual Machine. Log in as root user
    Issue commands as shown in figure and Check list of partitions on your server
If you see the above picture. You may notice sda. That is main disk sda1, sda2  are partitions of sda
sdb, sdc, sdd sde are the raw disks that we just added.
3. So now we need to create at least one partition one each disk.
How? check below picture.
4. Repeat above steps for remaining three disks. After done, once again execute cat /proc/partitions
5. Now open /etc/sysconfig/rawdevices and add following lines:
/dev/raw/raw1 /dev/sdb1
/dev/raw/raw2 /dev/sdc1
/dev/raw/raw3 /dev/sdd1
/dev/raw/raw4 /dev/sde1
for better Idea check below picture
After adding lines save it
6.  Restart the rawdevices service to make your changes effective.
How to restart services check below picture
7) Now give access to oracle user to use these raw disks
Execute commands as shown in figure
Now you can use these raw disks as ASM disks
In our next session we will start create ASM instance..
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