Primary instance in RAC hung

Our production is a 2 node RAC. Today in alert log of primary node we got the following error:
Potential blocker on resource CI-0000001E-00000002
And we found that we could not connect to our database, neither from primary nor secondary instance.
Ultimately we had to bounce Application services and database, can you please give me an idea what led to this problem?
Regards,
Arnab

The problem you describe here looks to have a lot of similarity with a problem described in note 745198.1 on metalink. The problem in the note described is caused by RMAN making a snapshot controlfile stored on an NFS file system (but this could be something else in your case). The issue is that the controlfile is locked for so long that the system is not able to use it. This causes the errors like you have encountered.
The solution in the note is to route the snapshot controlfile to a local file system.
Regards,
Gerwin Hendriksen

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in the below link
[http://docs.oracle.com/cd/B28359_01/server.111/b28294/concepts.htm#i1039416]
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Hi,
output as
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Edited by: Cerreia on 30/10/2009 19:42
Edited by: Cerreia on 30/10/2009 19:57

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VOL3
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*****SOLVED******
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DBCA
Manual
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http://oracleinstance.blogspot.com/2009/12/convert-single-instance-to-rac-instance.html(rconfig method)
http://onlineappsdba.com/index.php/2009/06/24/single-instance-to-rac-conversion/(using dbca)
http://oracleinstance.blogspot.com/2010/07/converting-single-instance-to-rac.html(using dbca)
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http://oracleinstance.blogspot.com/2009/12/migrate-from-database-file-system-to.html
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http://oracleinstance.blogspot.com

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user2931261 wrote:
Thanks
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Hi, all
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Hi,
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MMU

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Primary instance startup failiure

Good morning all ;
When trying to startup my primary instance i am getting following error.
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thanks in advance ..
SQL> archive log list;
Database log mode              Archive Mode
Automatic archival             Enabled
Archive destination            /home/oracle/org/oradata/arch/
Oldest online log sequence     9
Next log sequence to archive   10
Current log sequence           10

You can see that you have BOTH parameters set in the file.
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here is detail:
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