Site Preparation Guide, Third Edition - HP 9000 rp7420 Server

Chapter 1
System Specifications
Environmental Specifications
6
PCI/Mass Storage Section Cooling
Six 92 mm fans located between the mass storage devices and the PCI card cage provide airflow through
these devices. The PCI fans are powered with housekeeping power and run at full speed at all times. The air
is pulled through the mass storage devices and pushed through the PCI card cage. Perforation is provided
between the PCI bulkheads to allow adequate exhaust ventilation and to help reduce the localized airflow
dead spots that typically occur at the faceplate tail of each PCI card.
Standby Cooling
Several components within the chassis consume significant amounts of power while the system is in standby
mode. The system fans run at 1541 rpm, or 38% of full speed, during standby to remove the resulting heat
from the cabinet. The fans within the power supply will operate at full speed during standby.
Typical Power Dissipation and Cooling
The air conditioning data is derived using the following equations.
• Watts x (0.860) = kcal/hour
• Watts x (3.414) = Btu/hour
• Btu/hour divided by 12,000 = tons of refrigeration required
NOTE When determining power requirements you must consider any peripheral equipment that will
be installed during initial installation or as a later update. Refer to the applicable
documentation for such devices to determine the power and air-conditioning that is required to
support these devices.
Acoustic Noise Specification
The acoustic noise specification for the HP 9000 rp7420 Server is 57.3 db (sound pressure level at bystander
position). It is appropriate for dedicated computer room environments but not office environments. The LwA
is 7.5 Bels. Be sure to understand the acoustic noise specifications relative to operator positions within the
computer room or when adding servers to computer rooms with existing noise sources.
Table 1-5 Typical HP 9000 rp7420 Server Configurations
Cell
Boards
Memory
per Cell
Board
PCI Cards
(assumes
10 watts
each)
DVDs
Hard
Disk
Drives
Core
I/O
Bulk
Power
Supplies
Typical
Power
Typical
Cooling
Qty GBytes Qty Qty Qty Qty Qty Watts Btu/hr
2 16 16 1 4 2 2 2015 6879.21
2 8 8 0 2 2 2 1648 5626.27
2 4 8 0 2 2 2 1590 5482.26
1 4 8 0 1 1 2 995 3396.93