During these audits additional visual checks should include confirmation that blanking plates have been installed in empty spaces within cabinets in order to prevent supply / return air mixing / bypass. Cable management in the rear of cabinets should be examined to identify any restrictions or impediments to effective hot air exhausting.
Checks should also be conducted to ensure that vented floor tiles are not placed where they are not required. If there is no equipment in the immediate vicinity to be cooled there should be no vented floor tiles present (This includes the Hot Aisle!). If issues of this nature are spotted vented floor tiles should not be relocated without first consulting Data Centre Management and having formal change approval.
Regular checks should highlight any inconsistencies in hot aisle / cold aisle separation. Consider that the use of empty cabinets or partitioning to fill gaps between cabinets to reinforce hot aisle / cold aisle layout or containment.
The regular audits should confirm the accuracy of records of room layout, equipment locations and IT equipment details. This should include information on equipment manufacturer, model, installation date, purchase date, manufacture year, power requirements, space requirements, cooling requirements (temperature, humidity and airflow volume), equipment and application owner, warranty information, etc.
Within equipment cabinets should confirm the fact that the load should be properly balanced with the highest power rated equipment at the bottom of the cabinet (assuming cold air supply is via and under floor plenum). Less power consumptive hardware should be placed at the top of the cabinet with increasing equipment power requirements moving down the cabinet.
If no automated monitoring system is in place checks should also confirm that cabinet and PDU breaker loads are kept within agreed tolerances. Generally electrical infrastructure loading should be monitored and understood in the context of both overall capacity and the potential impact upon power supply redundancy in the event of a failure (E.G. N+1).
Insist on a documented process for managing the installation and removal of IT equipment from the computer room, which anticipates the impact on the power and cooling infrastructure and capacities. Equipment installations or removals should never be rushed through as an expediency and without adherence to standing procedures.
Housekeeping policies should enforce a technical environment free of contaminants such as dirt and debris or stored items including combustibles, cleaning equipment, shipping boxes, paper-based documentation or personal items.