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Chapter 20. 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 I/O. Rather, the I/O interruptions are brief enough so that
applications continue to operate without the need for downtime, maintenance, or user
notification.
This chapter includes the following sections:
System NDU
Shelf firmware NDU
Disk firmware NDU
ACP firmware NDU
RLM firmware NDU
Note: Upgrade the system software or firmware in the following order:
1. System firmware
2. Shelf firmware
3. Disk firmware
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