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IBM System Storage N series Hardware Guide by Marco Schwarz, Tom Provost, Steven Pemberton, Dirk Peitzmann, Jeff Lin, Roland Tretau

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Designing for nondisruptive upgrades
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. NDU has grown since its inception, and now incorporates the nondisruptive upgrade of system firmware as well.
This chapter covers NDU for the following areas:
System operating software (Data ONTAP) and firmware (BIOS)
Shelf firmware
Disk firmware
Alternate Control Path (ACP) firmware
The overall objective is to enable ...

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