Unable to Create ASM Disk Group for OCR and Voting Disk

When installing the Grid Infrastructure (GI) software for a 2 node RAC the other day, I came across an issue where the cluster was not able to create the ASM disk group for OCR and Voting Disk as it was not able to find the appropraite ASM disks.

Configuration Setting:

The following Grid Infrastructure (GI) ORACLE_HOME is:
GI_HOME=/u01/app/oracle/11.2.0.3/grid

A. Steps to Reproduce Issue

The issue occured when executing the root.sh with super user equivalent privileges:

oracle@lnx01:[GRID]$ sudo /u01/app/oracle/11.2.0.3/grid/root.sh

B. Error Reported

The following output was reported:
Performing root user operation for Oracle 11g
The following environment variables are set as:
    ORACLE_OWNER= grid
    ORACLE_HOME=  /u01/app/oracle/11.2.0.3/grid
Entries will be added to the /etc/oratab file as needed by
Database Configuration Assistant when a database is created
Finished running generic part of root script.
Now product-specific root actions will be performed.
Using configuration parameter file: /u01/app/oracle/11.2.0.3/grid/crs/install/crsconfig_params
User ignored Prerequisites during installation
CRS-2672: Attempting to start 'ora.cssdmonitor' on 'lnx01'
CRS-2676: Start of 'ora.cssdmonitor' on 'lnx01' succeeded
CRS-2672: Attempting to start 'ora.cssd' on 'lnx01'
CRS-2672: Attempting to start 'ora.diskmon' on 'lnx01'
CRS-2676: Start of 'ora.diskmon' on 'lnx01' succeeded
CRS-2676: Start of 'ora.cssd' on 'lnx01' succeeded

Disk Group DG_CCF creation failed with the following message:
ORA-15018: diskgroup cannot be created
ORA-15031: disk specification '/dev/asm_ccf3' matches no disks
ORA-15031: disk specification '/dev/asm_ccf2' matches no disks
ORA-15031: disk specification '/dev/asm_ccf1' matches no disks
This error is also found in the log:
${GI_HOME}/install/root_<HOST>_<TIMESTAMP>.log

C. Solution 

1. Verify partitions are visible and has the appropriate permission and ownership.  If not request your system administrator to correct issue:

oracle@lnx01:[GRID]$ ls -l /dev/sd*1

NOTE:  These devices may have a different name to /dev/sd*1, please check with your system administrator.

2. If running on Linux platform, mark asm disks using oracleasm (ie oracle asmlib is installed). Otherwise this step can be skipped.

oracle@lnx01:[GRID]$ oracleasm createdisk CCF1 /dev/sdb1
oracle@lnx01:[GRID]$ oracleasm createdisk CCF2 /dev/sdc1
oracle@lnx01:[GRID]$ oracleasm createdisk CCF3 /dev/sdd1

3. Edit the ${GI_HOME}/crs/install/crsconfig_params file and correct the path for ASM disks.

Example:
oracle.install.asm.diskGroup.disks=/dev/oracleasm/disks/CCF1,/dev/oracleasm/disks/CCF2,/dev/oracleasm/disks/CCF3
oracle.install.asm.diskGroup.diskDiscoveryString=/dev/oracleasm/disks/*
NOTE:  If using oracleasm specify the /dev/oracleasm/disks path to disks.  Otherwise specify the path to psuedo device name.  Please check with your system administrator for device name allocated for ASM disks.

4. Re-execute the root.sh script as super equivalent user.

oracle@lnx01:[GRID]$ sudo /u01/app/oracle/11.2.0.3/grid/root.sh
5. The execution of the root.sh script should now complete successfully.