HP Array Controller HSG V8.7 Software - Manual (Page 34)

Introducing the UltraSCSI RAID Enclosure
1–12 UltraSCSI RAID Enclosure
Redundant Power Supply Configuration
Adding three power supplies and a second ac input box provides
significantly more power redundancy than the standard configuration.
The redundant power supply configuration uses a single ac power
source. A system power failure will occur for any of the following
conditions:
• Loss of the ac power source
• Failure of both ac input boxes
• Failure of five power supplies
This configuration provides additional power supply redundancy.
Optimum Power Configuration
Adding three shelf power supplies, a second ac input box, and a
second ac power source provides optimum power redundancy. With
separate ac power sources for each ac input box, there are no single
points of failure.
Note
For optimum operation, each ac input box should use a
different ac power source.
A system power failure will occur for any of the following conditions:
• Loss of both ac power sources
• Failure of both ac input boxes
• Failure of five power supplies
• Failure of the ac power source for bus B and one power supply on
bus A
• Failure of the ac power source on bus A and one power supply on
bus B
• Failure of the ac input box on bus B and one power supply on
bus A
• Failure of the ac input box on bus A and one power supply on
bus B