You can add disks to ASM Disk group as follows. here specify the logical disk name and add disk to ASM Disk group as follows. Firstly list the disks and their name.

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SQL> alter diskgroup DATA add disk '/dev/oracleasm/disks/DATA01';

Diskgroup altered.

SQL> alter diskgroup DATA add disk '/dev/oracleasm/disks/DATA02';

Diskgroup altered.

SQL>

ALTER DISKGROUP DATA ADD DISK '/dev/mapper/asmdata1' NAME DATA_0001 SIZE 102399 M REBALANCE POWER 10;

select DISK_NUMBER,name ,PATH, MOUNT_DATE from v$asm_disk;

Then drop the related disk. check the drop and add disk operation status using the v$asm_operation view as follows.

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select DISK_NUMBER,name ,PATH, MOUNT_DATE from v$asm_disk;

alter diskgroup DATA drop disk DATA_0001;

select * from v$asm_operation;

ALTER DISKGROUP DATA REBALANCE POWER 8 NOWAIT;

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