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It is strange that the same didn't arise with the Grid Infrastructure installation. Didn't you have warnings at the end of the GI? Have you touched the OLR after GI installation?.
If it is only permission, it can be resolved easly (with chmod 600 /u01/app/oracle/product/11.2.0/grid/cdata/localhost/localhost.olr), but that file must have been created with the proper permission the first time, you need to investigate why it ended that way to be sure the installation is ok.
Please read the note *RAC and Oracle Clusterware Best Practices and Starter Kit (Linux) [ID 811306.1]* to validate that you haven't missed any recommendation.