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Nondisruptive upgrade requirements

Nondisruptive upgrades do not require downtime and are available on most HA configurations.

In a nondisruptive upgrade (NDU), high-availability technology allows a takeover storage system to assume the functions of the "failed" partner while it is being upgraded. There is a takeover and giveback operation for each HA node (storage system that is part of a high-availability relationship). Because the partner node fulfills service requests during the "failed" system's upgrade, no disruption in service is experienced by the clients.

In addition, because the takeover system assures continuous availability of the "failed" system's disks, more extensive upgrades requiring a system halt—such as system firmware updates and hardware adapter replacements—can be performed without disrupting services based on stateless protocols.