User guide

Rack information C–19
Hitachi Unified Storage VM Block Module Hardware User Guide
Blanking panels
If all the vertical mounting space in a rack is not occupied by rack-mounted
products, cover the empty space with blanking panels. Otherwise, the
empty gaps between the components can cause airflow changes that may
adversely affect cooling within the rack.
Cable guidelines
• Be sure all cables are correctly and fully connected.
• Do not obstruct walkways when routing cables.
• Do not allow heavy material to be placed on cables. Do not place cables
near any apparatus that generates heat. Do not step on or subject
cables or connectors to shearing or pulling forces. If that happens, the
cable jacket could be damaged and could break, resulting in an electric
shock, fire, or loss of data.
• Be sure all electrical and signal cables are clean before connecting them.
Any dirt on a connector should be removed before inserting the
connector into a socket.
Power guidelines
If installing third-party components in the rack, identify the component’s
amperage load, and check the current amperage load on the PDUs to
determine whether the component can be plugged into a PDU.
To reduce the risk of injury, fire, or damage to persons or equipment:
• Do not overload the AC supply branch circuit that provides power to the
rack. Consult the electrical authority having jurisdiction over your facility
wiring and installation requirements.
• When planning for power distribution and requirements for your rack
configuration:
• Balance the power load between available AC supply branch circuits.
• The overall system AC current load must not exceed 80% of the branch
circuit AC current rating.
• If an uninterruptable power supply (UPS) is used, the load should not
exceed 80% of the UPS’ marked electrical current rating.
To reduce the risk of damage to the equipment:
• Verify that all AC voltage selector switches are set correctly to match
your local AC line voltage (230V). If the AC voltage selector switch is not
properly set, your components may be damaged when power is applied.
• The installation of rack and mounted components must comply with local
and regional electrical regulations governing the installation of
Information Technology Equipment by licensed electricians. For
electrical power ratings on components, refer to their product rating
label or user documentation supplied.