How to create ASM device disk groups

I have new Oracle unbreakable linux installed. I have Oracle 11g running. Now I'm wanting to install ASM. When going through dbca - there are no available disk groups. When I click on "Create New" - there are no member disks for me to use. Normally these are already created for me by unix admin, but this is home set-up. Appreciate any help.

Hi,
You need to apply below RPM's and configure the ASMLIB, follow below steps, after the setup install the ASM and then it will show the avaliable disks.
Required RPM for ASM Configuration
oracleasm-support-2.0.1-1.i386.rpm
oracleasm-2.4.21-37.EL-1.0.4-1.i686.rpm
oracleasmlib-2.0.1-1.i386.rpm
Configuring ASMLib
Before using ASMLib, you must run a configuration script to prepare the driver. Run the following command as root, and answer the prompts as shown in the example below. Run this on each node in the cluster.
/etc/init.d/oracleasm configure
Configuring the Oracle ASM library driver
This will configure the on-boot properties of the Oracle ASM library driver. The following questions will determine whether the driver is loaded on boot and what permissions it will have. The current values
will be shown in brackets ('[]'). Hitting <ENTER> without typing an answer will keep that current value. Ctrl-C will abort.
Default user to own the driver interface []: oracle Default group to own the driver interface []: dba Start Oracle ASM library driver on boot (y/n) [n]: y Fix permissions of Oracle ASM disks on boot (y/n) [y]: y
Writing Oracle ASM library driver configuration: [ OK ] Creating /dev/oracleasm mount point: [ OK ] Loading module "oracleasm": [ OK ] Mounting ASMlib driver filesystem: [ OK ] Scanning system for ASM disks: [ OK ]
Next you tell the ASM driver which disks you want it to use. Oracle recommends that each disk contain a single partition for the entire disk. See Partitioning the Disks at the beginning of this section for an example of creating disk partitions.
You mark disks for use by ASMLib by running the following command as root from one of the cluster nodes, run it from node 1:
/etc/init.d/oracleasm createdisk DISK_NAME device_name
Tip: Enter the DISK_NAME in UPPERCASE letters.
Ex:
[root@vmractest1 ASMlib]# /etc/init.d/oracleasm createdisk VOL1 /dev/sdc1
Marking disk "/dev/sdd1" as an ASM disk: [ OK ]
[root@vmractest1 ASMlib]# /etc/init.d/oracleasm createdisk VOL2 /dev/sdd1
Marking disk "/dev/sdd1" as an ASM disk: [ OK ]
[root@vmractest1 ASMlib]# /etc/init.d/oracleasm createdisk VOL3 /dev/sde1
Marking disk "/dev/sde1" as an ASM disk: [ OK ]
Verify that ASMLib has marked the disks:
[root@vmractest1 ASMlib]# /etc/init.d/oracleasm listdisks
VOL1
VOL2
VOL3
On all other cluster nodes, run the following command as root to scan for configured ASMLib disks:
/etc/init.d/oracleasm scandisks
Ex:
[root@vmractest2 ASMlib_install]# /etc/init.d/oracleasm scandisks
Scanning system for ASM disks: [ OK ]
[root@vmractest3 ASMlib_install]# /etc/init.d/oracleasm scandisks
Scanning system for ASM disks: [ OK ]
And then check that everything is as in the first node:
[root@vmractest2 ASMlib_install]# /etc/init.d/oracleasm listdisks
VOL1
VOL2
VOL3
[root@vmractest3 ASMlib_install]# /etc/init.d/oracleasm listdisks
VOL1
VOL2
VOL3
The above steps are clearly explained in the document " http://blogs.oracle.com/content/dav/oracle/mtblog/A/Al/AlejandroVargas/gems/StepbyStepRAConLinux3.pdf " under section *11- Configure ASMlib for ASM Management*
If you still have issues please do let us know.
Regards,
Satya.

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