Saturday, June 1, 2013

OCR and Voting Disk on ASM in Oracle 10g and 11g

In Oracle 11g there is a great feature where we can put the OCR and Voting disk files on ASM but in Oracle earlier version it was not possible.

The reason is,
In 11g, Clusterware can access the OCR and Voting disk files even if the ASM instance is down and it can start the CRS and CSS services.
But in Oracle 10g, ASM instance could not be bring up as while startup it throws error as "ORA-29701:unable to connect to Cluster Manager". Coz to bring the ASM instance up first you need to start the CRS services. So in this case if the OCR and Voting disk files resides on ASM then definitely those services should be UP which couldn't be possible as ASM is not UP and it depends upon CRS.
Is n't this very interesting... :)

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