The upgrade scenario that explicitly required an upgrade or change of power supplies, due to a change in supported voltage, is C. X50R2 > X50R3.
Breakdown of the power supply requirements:
The FlashArray//XR2 models, including the //X50R2, were capable of operating on both low-line power (90–140V, or nominally 100–127V) and high-line power (180–264V, or nominally 200–240V).
However, the FlashArray//XR3 (//X50R3) has a stricter power requirement: it must run on high-line power (180 - 264 V) and cannot use 120 VAC, which distinguishes it from previous generations of //X50.
Therefore, if a FlashArray//X50R2 was operating on 120 VAC, an upgrade to a FlashArray//X50R3 would necessitate an upgrade to the power supplies or the facility power connection to support the required high-line voltage
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