HP Array Controller HSG V8.7 Software - Manual (Page 135)

Power Distribution
UltraSCSI RAID Enclosure 6–9
To implement this configuration from an n+1 configuration, order the
following additional components:
• 3 — power supplies (DS–BA35X–HH)
• 1 — ac input box (DS–BA35X–HE)
This power configuration provides data protection through maximum
redundancy of all enclosure power system components. Any one of
the following power-related error conditions will cause this UltraSCSI
RAID enclosure to cease operation:
• Loss of the ac power source
• Failure of five shelf power supplies
• Failure of both ac input boxes
Optimum (n+4) Power Supply Configurations
The only difference between this configuration and the redundant
(n+4) configuration is the use of two separate ac power sources. One
ac power source provides power to ac input box A; the other ac power
source provides ac power to ac input box B.
To implement this configuration from a standard n+1 configuration,
order the following additional components:
• 3 — power supplies (DS–BA35X–HH)
• 1 — ac input box (DS–BA35X–HE)
To implement this configuration from n+1 or an n+4 configuration
requires a second ac power source.
Compaq recommends using this power configuration to eliminate all
single points of power failure. The optimum power configuration
provides complete data protection with maximum redundancy of all
enclosure power system components and the ac input power source.
Any one of the following power related error conditions will cause
this UltraSCSI RAID enclosure to cease operation:
• Loss of both ac power sources
• Failure of both ac input boxes
• Failure of five power supplies