Chapter 6. Upgrading controller hardware
Considerations for upgrading controller hardware
To plan for the upgrade, you should familiarize yourself with the general upgrade considerations. If
necessary, you should contact technical support for recommendations and guidance specific to the
configuration of your cluster.
• Both the original controllers and the new controllers must be running the same and supported software
version before the upgrade.
ONTAP 9 Upgrade and Revert/Downgrade Guide
• You must observe the maximum cluster size. When you upgrade by moving volumes, new controllers are
joined to the cluster before the original controllers are removed from the cluster. You must be sure that the
number of controllers in the cluster does not exceed the supported maximum cluster size during the
procedure.
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• When combining different platform models of controllers in a cluster, you must be aware of the storage
platform mixing rules.
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• The new controllers must have enough storage to accommodate storage associated with the original
controllers.
ONTAP 9 Disks and Aggregates Power Guide
• The procedure for upgrading by moving storage is disruptive; the procedure for upgrading by moving
volumes is nondisruptive.
• If the new system has fewer slots than the original system, or if it has fewer or different types of ports, you
might need to add an adapter to the new system.
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• For controllers that are in a MetroCluster configuration, the controllers must not be in a switchover state
when you perform the upgrade.
• If the original controllers or new controllers use FlexArray Virtualization software, you might need to
perform additional steps.
• If your cluster has SAN hosts, you should familiarize yourself with potential issues about LUN serial
number changes and the steps in resolving the issues.
• If your system uses out-of-band ACP, you might need to migrate from out-of-band ACP to in-band ACP.
Methods for upgrading controller hardware
In general, how you upgrade the controller hardware depends on the platform models of the original
controllers. You upgrade either by moving the storage (a disruptive procedure) or by moving the volumes (a
nondisruptive procedure).
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