In the cluster of the oracle Database 12c, the specified spfile under dbs does not take effect.

In the 11g cluster, we usually use the initialization file (pfile) under dbs to specify the actual spfile in asm.

[Oracle @ ol6-112-rac1 dbs] $ cd/u01/app/oracle/product/11.2.0.4/db_1/dbs
[Oracle @ ol6-112-rac1 dbs] $ ls
Hc_acfsdb.dat hc_cdbrac_1.dat hc_cdbrac_2.dat initcdbrac_1.ora initcdbrac_1.ora.orig init. ora orapwacfsdb spfileacfsdb. ora
[Oracle @ ol6-121-rac1 dbs] $ cat initcdbrac_1.ora
SPFILE = '+ DATA/cdbrac/spfilecdbrac. ora'
[Oracle @ ol6-112-rac1 dbs] $

However, in 12c, if I modify the pfile specified by dbs to spfile, this setting will not take effect. For example, after I specify the file to the/tmp directory, you will find that, it still uses the spfile on asm:

[Oracle @ ol6-121-rac1 dbs] $ cat initcdbrac_1.ora
SPFILE = '/tmp/pfile. ora'
[Oracle @ ol6-121-rac1 dbs] $
[Oracle @ ol6-121-rac1 dbs] $ sqlplus "/as sysdba"
 
SQL * Plus: Release 12.1.0.1.0 Production on Thu Jun 23 11:24:12 2016
 
Copyright (c) 1982,201 3, Oracle. All rights reserved.
 
 
Connected:
Oracle Database 12c Enterprise Edition Release 12.1.0.1.0-64bit Production
With the Partitioning, Real Application Clusters, Automatic Storage Management, OLAP,
Advanced Analytics and Real Application Testing options
 
SQL> shutdown abort
ORACLE instance shut down.
SQL> startup nomount
ORACLE instance started.
 
Total System Global Area 1219260416 bytes
Fixed Size 2287768 bytes
Variable Size 838862696 bytes
Database Buffers 369098752 bytes
Redo Buffers 9011200 bytes
SQL> show parameter spfile
 
NAME TYPE VALUE
-----------------------------------------------------------------------------
Spfile string + DATA/cdbrac/spfilecdbrac. ora
 
SQL> exit

This is because the spfile information in the 12c cluster is fixed in ocr, and the configuration in the dbs directory is not considered.

[Oracle @ ol6-121-rac1 dbs] $ srvctl config database-d cdbrac | grep spfile
Spfile: + DATA/cdbrac/spfilecdbrac. ora
[Oracle @ ol6-121-rac1 dbs] $

To modify the spfile path, you must modify the ocr information:

[Oracle @ ol6-121-rac1 dbs] $ srvctl modify database-d cdbrac-spfile '/tmp/pfile. ora'
[Oracle @ ol6-121-rac1 dbs] $
[Oracle @ ol6-121-rac1 dbs] $
[Oracle @ ol6-121-rac1 dbs] $ sqlplus "/as sysdba"
 
SQL * Plus: Release 12.1.0.1.0 Production on Thu Jun 23 11:27:48 2016
 
Copyright (c) 1982,201 3, Oracle. All rights reserved.
 
 
Connected:
Oracle Database 12c Enterprise Edition Release 12.1.0.1.0-64bit Production
With the Partitioning, Real Application Clusters, Automatic Storage Management, OLAP,
Advanced Analytics and Real Application Testing options
 
SQL> shutdown abort
ORACLE instance shut down.
SQL> startup nomount
ORACLE instance started.
 
Total System Global Area 1219260416 bytes
Fixed Size 2287768 bytes
Variable Size 838862696 bytes
Database Buffers 369098752 bytes
Redo Buffers 9011200 bytes
SQL>
SQL> show parameter spfile
 
NAME TYPE VALUE
-----------------------------------------------------------------------------
Spfile string/tmp/pfile. ora
 
SQL> shutdown abort
ORACLE instance shut down.
SQL> exit

Oracle 12c discards the spfile path written in init. ora under dbs. I guess it is because there is a flex cluster in 12c. That is to say, instance1 can run to host 2 of node 2. If there is an initsid2.ora file in the dbs directory of host 2 in the original mode, instance 1 cannot be called. Therefore, the init file in the dbs directory is discarded.