HP P10000, Manual

Page: 26 / 61

Table 13 Environmental Specifications for HP 3PAR Storage Systems (continued)
Value Specification
50 –95° F (10 –35° C)
3,000–10,000 ft (914–3,048 m)
–40 –203° F (–40– 95° C) Nonoperating
0–40,000 ft (0–12,192 m)
Temperature gradient
18° F/hr (10° C/hr) Operating
18° F/hr (10° C/hr) Nonoperating
20 – 80 percent noncondensing, maximum gradient Relative humidity
10 percent per hour
Maintaining the Optimal Temperature
The level of cooling required for the HP 3PAR Storage Systems is quite different from the
air-conditioning used in offices. Comfort air-conditioning systems are designed for the lower heat
and higher moisture generated by the human body. In contrast, equipment has high heat output
that is moisture-free (sensible heat). In comfort systems, sensible heat normally produces 60 to 70
percent of the load, whereas the dry heat of electronic equipment produces a sensible heat ratio
of over 95 percent.
Prior to installation, verify that the operating site is equipped with a cooling system that can support
all thermal emissions. Use the average and maximum thermal emissions of storage server components
listed in
Table 14 (page 26) to estimate the cooling requirements for a storage system based on
a specific system configuration.
Proper site layout is critical to ensure the ambient temperature near the intake of the system does
not rise beyond the system specifications. Exceeding the maximum ambient temperature for any
period negatively affects the system’s reliability and performance, and continued operation for
extended periods under such conditions might actually cause the system to shut down.
CAUTION: Heated air from nearby equipment should not exhaust into the front of the storage
system.
Table 14 Thermal Emissions of Storage System Components
Maximum Thermal Emissions Average Thermal Emissions Component (Fully Populated)
3,004 BTU/hr (757 Kcal/hr) 2,164 BTU/hr (545.3 Kcal/hr) Controller node (pair)
1
4,973 BTU/hr (1,253.2 Kcal/hr) 3,657 BTU/hr (921.6 Kcal/hr) Drive chassis (single)
9,946 BTU/hr (2,506.4 Kcal/hr) 7,314 BTU/hr (1,843.2 Kcal/hr) Drive chassis (pair)
2
1 Controller nodes can only be installed in pairs.
2 HP P10000 3PAR Storage Systems require a minimum of two drive chassis; however, additional drive chassis can be
installed individually.
Storage systems can tolerate temperature and humidity fluctuations if the specified guidelines are
understood and followed. Exposure to conditions outside the specified ranges may damage the
system or its components.
Before a system is powered on, the air entering the subsystem must be clean and within the ranges
specified for temperatures and humidity. The room humidity must be kept sufficiently low to prevent
condensation on or within the subsystem, and must never exceed the limit specified in the subsystem
26 Structural/Environmental Considerations