ORA-15031: disk specification ‘/dev/oracleasm/disks/ASM_FRA01’ matches no disks

When tried to create diskgroup FRA, and got errors as below:

SQL> CREATE DISKGROUP FRA EXTERNAL REDUNDANCY DISK '/dev/oracleasm/disks/ASM_FRA01' NAME ASM_FRA01;
CREATE DISKGROUP FRA EXTERNAL REDUNDANCY DISK '/dev/oracleasm/disks/ASM_FRA01' NAME ASM_FRA01
*
ERROR at line 1:
ORA-15018: diskgroup cannot be created
ORA-15031: disk specification '/dev/oracleasm/disks/ASM_FRA01' matches no disks
ORA-15014: path '/dev/oracleasm/disks/ASM_FRA01' is not in the discovery set

Checked ASM disk already existed:

# oracleasm listdisks
...
...
ASM_FRA01
OCR_VOTE01
...
...

SQL> ! ls -ltr /dev/oracleasm/disks/ASM_FRA01
brw-rw---- 1 grid dba 253, 2 Sep 26 15:32 /dev/oracleasm/disks/ASM_FRA01

Checked parameter asm_diskstring empty:

SQL> show parameter string

NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
asm_diskstring string

It is nice to set up parameter asm_diskstring as below, but it is not compulsory:

SQL>alter system set asm_diskstring='ORCL:*';
System altered.

Try to create diskgroup FRA again with different disk name:

SQL> CREATE DISKGROUP FRA EXTERNAL REDUNDANCY DISK 'ORCL:ASM_FRA01' NAME ASM_FRA01;

Diskgroup created.
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