ASM

connect sys as sysasm;

CREATE DISKGROUP FRA
EXTERNAL REDUNDANCY
DISK '/dev/oracleasm/disks/ASM5'
NAME ASM5;

ALTER DISKGROUP FRA
ADD DISK '/dev/oracleasm/disks/ASM6' NAME ASM6;


select group_number,disk_number,mode_status,name
from v$asm_disk;

SELECT *
FROM V$ASM_OPERATION;


create diskgroup fra external redundancy
disk '/dev/oracleasm/disks/ASM5' NAME FRA001
disk '/dev/oracleasm/disks/ASM6' NAME FRA002
disk '/dev/oracleasm/disks/ASM7' NAME FRA003
disk '/dev/oracleasm/disks/ASM8' NAME FRA004
ATTRIBUTE 'au_size'='4M',
'compatible.asm'='11.2',
'compatible.rdbms'='11.2';

http://www.dbajunior.com/create-asm-disk-groups/