Which best describes a cluster rolling software upgrade?
A.
An upgrade that is rolled-out to both controllers simultaneously
B.
A procedure in which clustered controllers 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
C.
An upgrade that rolls together all previous updates
D.
A procedure where cluster controllers are rolled through software upgrades one by one,
keeping both controllers at the same version at all times in case of failover
E.
A cluster of software upgrades, intended to roll a system to the latest software version
Explanation:
Rolling software upgrades areupgrades in whichone head is upgraded while the
other provides service running the older software, then thesecond head is upgraded once the new
software is validated.
Sun ZFS Storage 7000 System Administration Guide, Takeover and Failback