NonStop NS16000 Series Planning Guide (H06.11+)

planned orderly shutdown at a predetermined time in the event of an extended power failure. A
timely and orderly shutdown prevents an uncontrolled and asymmetric shutdown of the system
resources from depleted UPS batteries. The R5000 UPS supports the OSM power failure support
function that allows you to set a ride-through time. If AC power is not restored before the specified
ride-through time expires, OSM initiates an orderly system shutdown. For additional information,
see “AC Power Monitoring” (page 156), “OSM Power Fail Support” (page 156), and “Considerations
for Ride-Through Time Configuration” (page 157).
You can order an optional R5000 UPS for each modular cabinet to supply power to the enclosures
within that cabinet. Up to two extended runtime modules (ERMs) can be included with the R5000
UPS to extend the power back-up time. If you add an R5000 UPS to a modular cabinet in the field,
the PDU on the left side is replaced with HP extension bars. The extension bars are oriented inward,
facing the components within the cabinet.
• Use R5000 ERM(s) with the R5000 UPS.
• Use R5500 XR ERM(s) with the R5500 XR UPS.
For complete information and specifications on the R5000 UPS, contact your HP representative or
refer to the HP UPS R5000 User Guide.
If you install a UPS other than the R5000 UPS or R5500 XR UPS in each modular cabinet of an
Integrity NonStop NS16000 series system, these requirements must be met to insure the system
can survive a total AC power failure:
• The UPS output voltage can support the HP PDU input voltage requirements.
• The UPS phase output matches the PDU phase input. Both single-phase and 3-phase output
UPSs are supported. Both single-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 failure 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 NS16000 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.
34 Site Preparation Guidelines