Steps to create ASM DISK and adding it to ASM DISKGROUP

Step 1:

Login to the server host01 switch yourself to the root execute below commands.

/etc/init.d/oracleasm createdisk ASMDISK_VD046p1 '/dev/mapper/host1_VD046p1'
/etc/init.d/oracleasm createdisk ASMDISK_VD047p1 '/dev/mapper/host1_VD047p1'
/etc/init.d/oracleasm createdisk ASMDISK_VD048p1 '/dev/mapper/host1_VD048p1'


Step 2:

Login as grid

/etc/init.d/oracleasm listdisks


Step 3:

run scan as root
/etc/init.d/oracleasm scandisks

run as grid
/etc/init.d/oracleasm listdisks

Step 4:
Login to grid user setup ASM environment and login as “sys as sysasm” execute below command in SQL environment.

Sql> alter diskgroup DATA add disk 'ORCL:ASMDISK_VD046p1','ORCL:ASMDISK_VD046p1','ORCL:ASMDISK_VD046p1' rebalance power 10;

Step 5:

Sql>select *From v$asm_operation;

Note: Keep running until you see no rows.