Sub-Floor
The open area underneath a raised computer floor, also called a sub-floor plenum.
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Leave a Comment (0) →Storage Array
A disk storage system which contains multiple disk drives. It is differentiated from a disk enclosure, in that an array has cache memory and advanced functionality, like RAID and virtualization. Attached to SAN for multiple devices to access and store data.
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Leave a Comment (0) →Storage Area Network (SAN)
A network of storage disks. In large enterprises, a SAN connects multiple servers to a centralized pool of disk storage. Compared to managing hundreds of servers, each with their own disks, SANs improve system administration. By treating all the company’s storage as a single resource, disk maintenance and routine backups are easier to schedule and control. In some SANs, the disks themselves can copy data to other disks for backup without any processing overhead at the host computers.
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Leave a Comment (0) →Static Transfer Switch (STS)
A solid state device which transfers the feed of power from one source to another source such as from the incoming utility to a generator.
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Leave a Comment (0) →Slab
Refers to either the ceiling or floor that is above a finished ceiling and/or below the raised floor. Often used to measure actual available height of an unfinished data center space and referred to as slab to slab height. Eg. If the raised floor is 3 feet, the finished ceiling is 2 feet and the the finished space is 10 feet; then the slab to slab height is 15 feet.
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Leave a Comment (0) →Short Cycling
Chilled airflow returning to cooling units without passing through IT equipment, also referred to as bypass.
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Leave a Comment (0) →SFP+
Small Form-factor Pluggable (SFP) Plus. High-density/high-bandwidth interconnect system used between servers and switches in data centers.
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Leave a Comment (0) →Set Point
In a control system, this is the value against which the variable that is being controlled is compared. Temperature and humidity set points are common in the cooling system for a data center.
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A computer or computer program that manages access to a centralized resource or service in a network.
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Leave a Comment (0) →Sensible Cooling
The action of lowering the dry bulb temperature of air without condensation taking place.
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Leave a Comment (0) →Secondary Loop
Refers to the water which is used to cool the heat exchangers in AHUs and is cooled via the expansion unit in a chiller.
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Leave a Comment (0) →RPP
Remote Power Panel. Electrical power distribution panel.
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Leave a Comment (0) →Router
A network device that forwards packets from one network to another. Based on internal routing tables, routers read each incoming packet and decide how to forward it. The destination address in the packets determines which line (interface) outgoing packets are directed to. In large-scale enterprise routers, the current traffic load, congestion, line costs and other factors determine which line to forward to.
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Leave a Comment (0) →Rooftop Unit (RTU)
An air handler designed for outdoor use mounted on a rooftop.
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Leave a Comment (0) →ROI
Return on Investment, a measure of the money that an entity earns as a percentage of the total value of its assets that are invested.
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Leave a Comment (0) →Rh
Relative Humidity. The amount of water vapor present in air expressed as a percentage of the amount needed for saturation at the same temperature.
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Leave a Comment (0) →Return Air
The heated air returning to air conditioning equipment.
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Leave a Comment (0) →Recirculation Air Handler (RAH)
A device that circulates air but does not cool the air.
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Leave a Comment (0) →Recirculation
Air which exits IT equipment and then re-enters either the same IT equipment or another piece of IT equipment without being cooled. Typically caused by poor control of airflow due to missing blanking panels, gaps in rows, insufficient air supply, etc.
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Leave a Comment (0) →Raised Metal Floor (RMF)
An alternate term for the more commonly used term ‘raised floor’.
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