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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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Non-disruptive operations
Non-Disruptive Upgrade (NDU) began as the process of upgrading Data ONTAP software on the two nodes in an HA pair controller configuration without interrupting I/O to connected client systems.
The overall objective is to enable upgrade and maintenance of the storage system without affecting the system’s ability to respond to foreground I/O requests. This does not mean that there is no interruption to client I/O. Rather, the I/O interruptions are brief enough so that applications continue to operate without the need for ...

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