Why my new Disk Group is not getting mounted automatically when ASM instance starts?

Today I faced the issue that a new ASM Disk Group created in instance +ASM1 is not getting automatically mounted in instance +ASM2.

The first step was to check DB dependencies:

[oracle@ol5-112-rac2 trace]$ srvctl config database -d RAC

Database unique name: RAC

Database name: RAC

Oracle home: /u01/app/oracle/product/11.2.0/db_1

Oracle user: oracle

Spfile: +DATA/RAC/spfileRAC.ora

Domain: localdomain

Start options: open

Stop options: immediate

Database role: PRIMARY

Management policy: AUTOMATIC

Server pools: RAC

Database instances: RAC1,RAC2

Disk Groups: DATA

Services: reports

Database is administrator managed

You can see that only dependent Disk Groups are ‘DATA’.

Let us add ‘FRA’ also as dependent Disk Group:

[oracle@ol5-112-rac2 trace]$ srvctl modify database -d RAC -a 'DATA,FRA'

[oracle@ol5-112-rac2 trace]$ srvctl config database -d RAC

Database unique name: RAC

Database name: RAC

Oracle home: /u01/app/oracle/product/11.2.0/db_1

Oracle user: oracle

Spfile: +DATA/RAC/spfileRAC.ora

Domain: localdomain

Start options: open

Stop options: immediate

Database role: PRIMARY

Management policy: AUTOMATIC

Server pools: RAC

Database instances: RAC1,RAC2

Disk Groups: DATA,FRA

Services: reports

Database is administrator managed

The next step is to add the Disk Groups to ASM_DISKGROUPS parameter:

SQL> ALTER SYSTEM SET ASM_DISKGROUPS='DATA','FRA' scope=both sid='+ASM1';

System altered.

SQL> ALTER SYSTEM SET ASM_DISKGROUPS='DATA','FRA' scope=both sid='+ASM2';

System altered.

After restarting +ASM2 instance we can see that FRA Disk Group is mounted automatically:

[oracle@ol5-112-rac2 trace]$ sqlplus / as sysasm

SQL*Plus: Release 11.2.0.1.0 Production on Wed Jun 12 15:44:44 2013

Copyright (c) 1982, 2009, Oracle.  All rights reserved.

Connected to:

Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production

With the Real Application Clusters and Automatic Storage Management options

SQL> set lines 1000

SQL> select * from V$ASM_DISKGROUP;

GROUP_NUMBER NAME                           SECTOR_SIZE BLOCK_SIZE ALLOCATION_UNIT_SIZE STATE       TYPE     TOTAL_MB    FREE_MB HOT_USED_MB COLD_USED_MB REQUIRED_MIRROR_FREE_MB USABLE_FILE_MB OFFLINE_DISKS COMPATIBILITY                                                DATABASE_COMPATIBILITY                                       V

------------ ------------------------------ ----------- ---------- -------------------- ----------- ------ ---------- ---------- ----------- ------------ ----------------------- -------------- ------------- ------------------------------------------------------------ ------------------------------------------------------------ -

           1 DATA                                   512       4096              1048576 MOUNTED     EXTERN      15342      12616           0         2726                       0          12616     0 11.2.0.0.0                                                   10.1.0.0.0                                                   N

           2 FRA                                    512       4096              1048576 MOUNTED     EXTERN       6133       5962           0          171                       0           5962     0 11.2.0.0.0                                                   10.1.0.0.0                                                   N

SQL> exit

Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production

With the Real Application Clusters and Automatic Storage Management options

Thanks,

Alfredo