Dell Acceleration Appliances for Databases - Manual (Page 78)

It is very important to note that this count of files (6 OCR and 5 Voting) means one of the LUNs will
not have a Voting File. It is critical that no single ION Accelerator node have a majority of the Voting
Disk files, because if a majority of them go offline, Oracle aborts the entire cluster.
For example, in a two-node configuration there would be three voting files on the first node and two
on the second node. Taking the second node offline for maintenance is not a problem, because the
majority of Voting Files are still online. However, taking the first node offline causes the entire cluster
to abort. The solution calls for a third storage node, which can be a third ION Accelerator node or a
legacy SAN. With three storage nodes, two voting files are placed on the first, two on the second,
and one on the third. Now, no single node contains a majority of voting files, so the cluster is not
aborted.
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