With regards to maintaining cluster quorum, epsilon functions as a:

Epsilon is not a master node designation - it is a voting weight attribute, and the node holding epsilon does not assume a master role beyond quorum resolution.

Epsilon has nothing to do with duplicating the management database - it is strictly a quorum voting mechanism.

Epsilon does not designate a secondary node; it is an attribute that can be reassigned to any node in the cluster.

In NetApp clustered ONTAP, epsilon is an extra fractional vote (weight) assigned to exactly one node in the cluster. When a network partition creates an even split of votes, the partition containing the node holding epsilon has the majority and wins quorum, acting as a tie-breaker. This mechanism prevents split-brain scenarios without requiring a separate arbitration device.