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A customer requests a software upgrade of ZFS storage cluster pairs without any down time. Which option meets this requirement?
A. an upgrade that rolls together all preceding updates
B. an upgrade that is rolled out to both controllers simultaneously
C. clustered controllers that are upgraded one at a time (“rolling” from one to the next) such that, at any given time, the controller being upgraded controls no resources
D. cluster controllers that are rolled through software upgrades one by one, keeping both controllers at the same version at all times in case of failover
Correct Answer: C
Explanation/Reference:
Explanation:
Clusters support rolling upgrade of software, which can reduce the business disruption associated with migrating to newer software.
Takeover can occur at any time. Takeover is attempted whenever peer failure is detected. It can also be triggered manually using the cluster configuration CLI or BUI. This is useful for testing purposes as well as to perform rolling software upgrades (upgrades in which one head is upgraded while the other provides service running the older software, then the second head is upgraded once the new software is validated).
References: https://docs.oracle.com/cd/E27998_01/html/E48433/configuration__cluster.html
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