SK0-004 · Question #780
A blade enclosure has a capacity of four 2000W power supplies with one 2000W power supply installed. The power requirement of the blade enclosure is 1900W. Which of the following would occur if one…
The correct answer is A. The blade enclosure would now have redundant power. Adding a second 2000W power supply to an enclosure that requires 1900W means either PSU alone can sustain the load, providing true power redundancy (N+1).
Question
A blade enclosure has a capacity of four 2000W power supplies with one 2000W power supply installed. The power requirement of the blade enclosure is 1900W. Which of the following would occur if one additional 2000W power supply was added?
Options
- AThe blade enclosure would now have redundant power
- BThe blade enclosure would require additional cooling
- CThe blade enclosure power requirement would decrease
- DThe blade enclosure power supply would require a larger circuit
How the community answered
(30 responses)- A80% (24)
- B7% (2)
- C3% (1)
- D10% (3)
Why each option
Adding a second 2000W power supply to an enclosure that requires 1900W means either PSU alone can sustain the load, providing true power redundancy (N+1).
With a single 2000W PSU the enclosure has no failover capacity - if that PSU fails, the enclosure loses power. Adding a second 2000W PSU creates N+1 redundancy: the 1900W load is well within the capacity of either individual PSU, so the enclosure continues operating if one PSU fails. This is the definition of redundant power in blade infrastructure.
Adding a power supply does not increase the heat output of the blade modules themselves; cooling requirements are driven by the compute load, not the number of PSUs.
The enclosure's power consumption is determined by its installed blades and components, not by the number of PSUs; adding a PSU does not reduce load.
The total draw from the facility circuit remains 1900W regardless of how many PSUs are installed; no larger circuit breaker or feed is required.
Concept tested: Blade enclosure N+1 power supply redundancy
Source: https://www.snia.org/education/storage_networking_primer/iSCSI
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