Maintaining The Optimal Temperature - HP P10000 Manual

Table 13 Environmental Specifications for HP 3PAR Storage Systems (continued)
Specification
Temperature gradient
Relative humidity

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)
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:
system.
Table 14 Thermal Emissions of Storage System Components
Component (Fully Populated)
Controller node (pair)
Drive chassis (single)
Drive chassis (pair)
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
Nonoperating
Operating
Nonoperating
to estimate the cooling requirements for a storage system based on
Heated air from nearby equipment should not exhaust into the front of the storage
Average Thermal Emissions
1
2,164 BTU/hr (545.3 Kcal/hr)
3,657 BTU/hr (921.6 Kcal/hr)
2
7,314 BTU/hr (1,843.2 Kcal/hr)
Value
50 –95° F (10 –35° C)
3,000–10,000 ft (914–3,048 m)
–40 –203° F (–40– 95° C)
0–40,000 ft (0–12,192 m)
18° F/hr (10° C/hr)
18° F/hr (10° C/hr)
20 – 80 percent noncondensing, maximum gradient
10 percent per hour
Maximum Thermal Emissions
3,004 BTU/hr (757 Kcal/hr)
4,973 BTU/hr (1,253.2 Kcal/hr)
9,946 BTU/hr (2,506.4 Kcal/hr)