You could see high such waits in your database if you are using automatic memory management of the SGA ( the new feature in Oracle 10G )
Solution : Set manually the memory components of the SGA's database .
see also http://www.nocoug.org/Journal/NoCOUG_Journal_201008.pdf
Grid Infrastructure --- OCR and Voting Disks Location at Installation
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In Oracle Grid Infrastructure, the OCR (Oracle Cluster Registry) and
Voting "Disks" must be on Shared Storage accessible by all the nodes of the
Cluster...
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