Creating ASM base groups:
>> Before creating ASM groups, we should check “labels” and “raw partition or disk partition.”
NOTE: You can see that “TYPE=”oracleasm”” disks are already configured to be used for ASM groups.
>> We will use ASMCA utility for creating ASM disk groups ASMCA stands for (Automatic Storage Management Configuration Assistant). In order to launch this utility tool, we need to execute “xhost +” command in ROOT login.
>> Firstly, we switched to ROOT user and executed “xhost +” command and then we switched back to GRID user to launch ASMCA utility.
>> click on create.
>> Provide disk group name. We have given ASM_DG_DATA for this group.
>> You can find Redundancy with three different types (i.e HIGH, NORMAL and EXTERNAL). We have selected External(none).
>> Then select “Show Eligible” option under “Select Member Disks”. It will display all available disks. Select the required disks for your disk group and click OK. We have selected ORCL:VOL1.
>> Here creating a disk group ASM_DG_DATA.
>> disk group ASM_DG_DATA is created successfulled.
>> click on OK.
>> In above exhibit, you can see that ASM_DG_DATA group has been created with EXTERNAL Redundancy.
>> click Exit.
>> click on YES.