ORA-15001: DISKGROUP “DATA” DOES NOT EXIST OR IS NOT MOUNTED

Problem:

ORA-00210: cannot open the specified control file
ORA-00202: control file: '+DATA/kbazerdr/controlfile/current.256.825098041'
ORA-17503: ksfdopn:2 Failed to open file +DATA/kbazerdr/controlfile/current.256.825098041
ORA-15001: diskgroup "DATA" does not exist or is not mounted
ORA-15077: could not locate ASM instance serving a required diskgroup
ORA-205 signalled during: ALTER DATABASE MOUNT STANDBY DATABASE...

Analyze:

1) check if CRS is running on the node

$ crsctl check crs
CSS appears healthy
CRS appears healthy
EVM appears healthy

2) check if ASM instance is running

sys@+asm> select status from v$instance;
STATUS
————
STARTED

3) check diskgroup status

bash-3.2$ ps -afe | grep smon
 oracle 1788 1 0 Sep 24 ? 15:48 asm_smon_+ASM
 oracle 2807 2799 0 20:33:44 pts/4 0:00 grep smon
bash-3.2$ . oraenv
ORACLE_SID = [KBAZER] ? +ASM
The Oracle base remains unchanged with value /u01/app/oracle
bash-3.2$ asmcmd
ASMCMD> ls
ASMCMD> 
ASMCMD> 
ASMCMD> exit
bash-3.2$ 
bash-3.2$ sqlplus / as sysasm
SQL*Plus: Release 11.2.0.3.0 Production on Tue Mar 31 20:35:11 2015
Copyright (c) 1982, 2011, Oracle. All rights reserved.
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Automatic Storage Management option
SQL> 
SQL> 
SQL> select status from v$instance;

STATUS
------------
STARTED

SQL> select name, state from v$asm_diskgroup;

NAME STATE
------------------------------ -----------
DATA DISMOUNTED
ARCH DISMOUNTED

SQL> show parameter asm_diskgroups;

NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
asm_diskgroups string ARCH

Solution:

1) manually mount the diskgroups (sqlplus / as sysasm)

SQL> alter diskgroup DATA mount;
Diskgroup altered.

SQL> alter diskgroup ARCH mount;
Diskgroup altered.

SQL> select name, state from v$asm_diskgroup;

NAME STATE
------------------------------ -----------
DATA MOUNTED
ARCH MOUNTED

SQL> show parameter asm_diskgroups;

NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
asm_diskgroups string ARCH, DATA