Item Specification
Altitude In operation -300 to 3,000 m
In non-operation -300 to 12,000 m
Note 1. Also see the system Environmental specifications on page A-8.
Preparing for installation
This section covers preinstallation guidelines to observe before installing the
equipment in a Hitachi rack.
Planning considerations
The following information will help you plan an acceptable equipment rack
configuration.
To ensure personal safety, maintain a low center of gravity, and reduce the
chance of instability, install the storage system controller and drive trays
from the bottom of the rack upwards.
To ensure that internal heat build up is dissipated, do not restrict air flow
Be sure no vents are blocked, and that the HUS VM controller and drive trays
are away from a solid surface such as a wall or partition. Air flows through
the units from front to rear.
Note: In the Hitachi rack, 2U is reserved at the base of the rack. This leaves
40U of mountable space in the rack. Storage system units are mounted
starting from that point in the rack.
• Enclosed racks must have adequate ventilation. Ensure that the rack is
not overly congested, because each unit generates heat. An enclosed rack
should have louvered sides and a fan to provide cooling air.
• In an enclosed rack with a ventilation fan in the top, excessive heat
generated by equipment near the bottom of the rack can be drawn
upward and into the intake ports of the equipment above it in the rack.
Provide adequate ventilation for equipment at the bottom of the rack.
• Baffles can help isolate exhaust air from intake air, which also helps to
draw cooling air through the chassis. The best placement of the baffles
depends on the airflow patterns in the rack, which can be found by
experimenting with different arrangements.
• Consideration should be given to the floor ratings of the site where the
rack and units will be installed. For information about the weight of an
example storage controller and drive trays, see
Floor load ratings on page
C-10.
C-22
Rack information
Hitachi Unified Storage VM Block Module Hardware User Guide
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