User guide
C–20 Rack information
Hitachi Unified Storage VM Block Module Hardware User Guide
Grounding requirements
All powered equipment should be properly grounded for operation and
safety. Ground integrity should be maintained for each connection made in
a reliably grounded outlet, such as with the PDUs in the rack.
All system cabinets and racks must be grounded to the CO GRD system,
using a 6 AWG (or larger) Copper cable, terminated with listed 2-hole
compression lugs.
Environmental requirements
Table C-5: Rack internal environmental specifications1 on page C-20below
lists the environmental specifications for the HUS VM systems when
mounted in a Hitachi Data Systems rack. These specifications must be
observed to ensure the proper operating and storage environment for the
storage equipment in the rack.
The following environmental conditions may damage or decrease the life of
the storage system:
• Exposure to direct sunlight
• Rapid change in temperature or humidity (such as being near an air-
conditioner)
• Proximity (near) to a device which generates electrical noise, such as the
ungrounded motor of an air conditioner or washing machine
• Proximity (near) to a device that generates a strong magnetic field (Do
not bring a magnet close to the rack or the HUS VM system.)
• Exposure to dust, dirt, or vibration
Table C-5: Rack internal environmental specifications
1
Note: To reduce the risk of electric shock or damage to equipment, follow
proper grounding procedures and do not tamper with the pre-installed
PDUs. The rack connects to a grounded (earth) power outlet.
Note: To reduce the risk of damage to equipment during installation, do
not impede airflow to products already mounted in the rack and do not
exceed internal rack specifications listed in the following table.
Item Specification
Temperature In operation 10 to 40° C
Not-operating -10 to 50° C
In transport/storage -30 to 60 °C
Temperature change rate 10° C or less per hour
Humidity In operation 8 to 80%
In non-operation 8 to 90%
Maximum wet bulb temp. 29° C (non condensing)
Altitude In operation -300 to 3,000 m
In non-operation -300 to 12,000 m