NonStop NS1000 Planning Guide (H06.08+)

For power information, refer to “Model R5500 XR Integrated UPS” (page 29). For complete
information and specifications on the R5500 XR UPS, contact your HP representation or refer to
the HP UPS R5500 XR Models User Guide available at:
http://h10032.www1.hp.com/ctg/Manual/c00065453.pdf
If you install a UPS other than the HP model R5500 XR UPS in each modular cabinet of an Integrity
NonStop NS1000 system, these requirements must be met to insure the system can survive a
total AC power fail:
• The UPS output voltage can support the HP PDU input voltage requirements.
• The UPS phase output matches the PDU phase input. Both 1-phase and 3-phase output UPSs
are supported. Both1-phase and 3-phase input HP PDUs are supported.
• The UPS output can support the targeted system in the event of an AC power failure.
Calculate each cabinet load to insure the UPS can support a proper ride-through time in the
event of a total AC power failure.
NOTE: A UPS other than the HP model R5500 XR UPS will not be able to utilize the OSM
Power Fail Support function.
If your applications require a UPS that supports the entire system or even a UPS or motor
generator for all computer and support equipment in the site, you must plan the site’s electrical
infrastructure accordingly.
Cooling and Humidity Control
Do not rely on an intuitive approach to design cooling or to simply achieve an energy
balance—that is, summing up to the total power dissipation from all the hardware and sizing a
comparable air conditioning capacity. Today’s high-performance servers use semiconductors
that integrate multiple functions on a single chip with very high power densities. These chips,
plus high-power-density mass storage and power supplies, are mounted in ultra-thin server and
storage enclosures, and then deployed into computer racks in large numbers. This higher
concentration of devices results in localized heat, which increases the potential for hot spots that
can damage the equipment.
Additionally, variables in the installation site layout can adversely affect air flows and create hot
spots by allowing hot and cool air streams to mix. Studies have shown that above 70°F (20°C),
every increase of 18°F (10°C) reduces long-term electronics reliability by 50%.
Cooling airflow through each enclosure in the Integrity NonStop NS1000 server is front-to-back.
Because of high heat densities and hot spots, an accurate assessment of air flow around and
through the server equipment and specialized cooling design is essential for reliable server
operation. For an airflow assessment, consult with your HP cooling consultant or your heating,
ventilation, and air conditioning (HVAC) engineer.
NOTE: Failure of site cooling with the server continuing to run can cause rapid heat buildup
and excessive temperatures within the hardware. Excessive internal temperatures can result in
full or partial system shutdown. Ensure that the site’s cooling system remains fully operational
when the server is running.
Because each modular cabinet houses a unique combination of enclosures, use the “Heat
Dissipation Specifications and Worksheet” (page 33) to calculate the total heat dissipation for
the hardware installed in each cabinet. For air temperature levels at the site, refer to “Operating
Temperature, Humidity, and Altitude” (page 34).
Cooling and Humidity Control 21