Why does Oracle still use the voting disks when other cluster sofware is present?
Voting disks are still used when 3rd party vendor clusterware is present, because vendor clusterware is not able to monitor/detect all failures that matter to Oracle Clusterware and the database. For example one known case is when the vendor clusterware is set to have its heartbeat go over a different network than RAC traffic. Continuing to use the voting disks allows CSS to resolve situations which would otherwise end up in cluster hangs.
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