Designing for nondisruptive upgrades
Nondisruptive 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. NDU grew since its inception, and now incorporates the nondisruptive upgrade of system firmware as well.
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 ...

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