After upgrade the ASM instance from release 11.1 to release 11.2 existing database is unable to start/open due to the next error:

​​/u01/app/oracle/product/11.1.0/dbs>sqlplus​​​
​​SQL*Plus: Release 11.1.0.6.0 - Production on Wed Apr 7 15:49:33 2010​​
​​Copyright (c) 1982, 2007, Oracle. All rights reserved.​​
​​Enter user-name: / as sysdba​​​​Connected to an idle instance.​​
​​SQL> startup​​​​ORA-01078: failure in processing system parameters​​​​ORA-01565: error in identifying file '+ORADATA_DBAT/dbat/spfiledbat.ora'​​​​ORA-17503: ksfdopn:2 Failed to open file +ORADATA_DBAT/dbat/spfiledbat.ora​​​​ORA-15077: could not locate ASM instance serving a required diskgroup​​

Cause

The ocrconfig_loc variable in the /var/opt/oracle/ocr.loc file was still pointing to previous the ASM 11gR1 Oracle Home:

​​ocrconfig_loc=/u01/app/oracle/product/11.1.0/cdata/localhost/local.ocr​​​​local_only=TRUE​​

It should point to the new 11.2 Grid Oracle Home:

​​ocrconfig_loc=/u01/app/oracle/product/11.2.0/grid/cdata/localhost/local.ocr​​​​local_only=TRUE​​

Note: On Linux the ocr.loc file is located at: /etc/oracle/ocr.loc.

Solution

Please update the /var/opt/oracle/ocr.loc file with the next entries:

​​ocrconfig_loc=/u01/app/oracle/product/11.2.0/grid/cdata/localhost/local.ocr​​​​local_only=TRUE​​

From Oracle

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