Operational Requirements - Hitachi HA820 G2 User Manual

Operational requirements

Space and airflow requirements
To allow for servicing and adequate airflow, observe the following space and airflow requirements when deciding
where to install a rack:
• Leave a minimum clearance of 63.5 cm (25 in) in front of the rack.
Leave a minimum clearance of 76.2 cm (30 in) behind the rack.
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Leave a minimum clearance of 121.9 cm (48 in) from the back of the rack to the back of another rack or
•
row of racks.
Hitachi Advanced Server product draws in cool air through the front door and expel warm air through the rear
door. Therefore, the front and rear rack doors must be adequately ventilated to allow ambient room air to enter
the cabinet, and the rear door must be adequately ventilated to allow the warm air to escape from the cabinet.
CAUTION: To prevent improper cooling and damage to the equipment, do not block the ventilation
openings.
When vertical space in the rack is not filled by a server or rack component, the gaps between the components
cause changes in airflow through the rack and across the servers. Cover all gaps with blanking panels to
maintain proper airflow.
CAUTION: Always use blanking panels to fill empty vertical spaces in the rack. This arrangement ensures proper airflow.
Using a rack without blanking panels results in improper cooling that can lead to thermal damage.
CAUTION: If a third-party rack is used, observe the following additional requirements to ensure adequate
airflow and to prevent damage to the equipment:
Front and rear doors—If the 42U rack includes closing front and rear doors, you must allow 5,350
•
sq cm (830 sq in) of holes evenly distributed from top to bottom to permit adequate airflow
(equivalent to the required 64 percent open area for ventilation).
Side—The clearance between the installed rack component and the side panels of the rack must
•
be a minimum of 7 cm (2.75 in).
Temperature requirements
To ensure continued safe and reliable equipment operation, install or position the system in a well-ventilated,
climate- controlled environment.
The maximum recommended ambient operating temperature (TMRA) for most server products is 35°C (95°F).
The temperature in the room where the rack is located must not exceed 35°C (95°F).
CAUTION: To reduce the risk of damage to the equipment when installing third-party options:
Do not permit optional equipment to impede airflow around the server or to increase the internal rack
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temperature beyond the maximum allowable limits.
Do not exceed the manufacturer's TMRA.
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Hitachi Advanced Server HA820 G2 User Guide 52