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IBM System Storage N series Clustered Data ONTAP by Youn-Ho Yang, Tom Provost, Steven Pemberton, Michal Klimes, Christian Fey, Roland Tretau

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High availability (HA) pairs and failover behavior
High availability (HA) pairs provide hardware redundancy that is required for non-disruptive operations and fault tolerance. They give each node in the pair the software functionality to take over its partner's storage and subsequently give back the storage.
Takeover and giveback are the operations that let you take advantage of the HA configuration to perform non-disruptive operations and avoid service interruptions. Takeover is the process in which a node takes over the storage of its partner. ...

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