Meeting Environmental Conditions; Maintaining The Optimal Temperature; Thermal Emissions Of Components - HP 3PAR StoreServ 7450c Planning Manual

NOTE: For information on options available for the Intelligent Series Rack, refer to the Rack
Options Catalog at www.hp.com/go/rackandpower.
For information on rack requirements and considerations, see the Best practices for HP Intelligent
Series Rack Family white paper.

Meeting Environmental Conditions

HP recommends that you maintain a controlled environment with a high degree of cleanliness,
close control of temperature and humidity, and infrequent access by personnel.
CAUTION:
and from dust and other environmental contaminants.

Maintaining the Optimal Temperature

The level of cooling required for the storage systems is quite different from the air-conditioning
used in offices. Air conditioning systems for comfort 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 60–70% of the
load, whereas the dry heat of electronic equipment produces a sensible heat ratio of over 95%.
Prior to installation, verify the operating site is equipped with a cooling system that can support
all thermal emissions.
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 reliability and performance of the system. Continued operation for
extended periods under such conditions might actually cause the system to shut down.
CAUTION:
system.
Use the following average and maximum thermal emissions of storage system components to
estimate the cooling requirements for a storage system based on a specific system configuration.
Table 9 Thermal Emissions of Components
Component (Fully Populated)
Controller node (pair)
Drive enclosure (single)
Drive enclosure (pair)
1
Controller nodes can only be installed in pairs.
2
Storage systems require a minimum of two drive enclosure. However, additional drive enclosure 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 temperature 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
environmental requirements tables, including transient humidity. The system must never be exposed
to conditions that could cause internal condensation to occur within the subsystem.
The air conditioning units should have controls monitoring thermal conditions underneath the floor.
Humidification is normally required to replace moisture removed during the cooling process. The
The storage system operating environment must be free from continuous vibration
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)
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)
Meeting Environmental Conditions 19