NonStop NS14000 Series Planning Guide (H06.13+)

replaced with HP extension bars. The extension bars are oriented inward, facing the components
within the cabinet.
For complete information and specifications on the HP R5000 UPS or HP R5500 XR UPS, contact
your HP representation or refer to the HP UPS R5000 Models User Guide or 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 R5000 UPS or HP R5500 XR UPS in each modular cabinet
of a NonStop NS14000 series 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. Both 1-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 R5000 UPS or HP 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 modular cabinets 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 NonStop NS14000 series 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 64) 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 64).
38 Site Preparation Guidelines