I.6 Glossary

• Availability - service availability ( MTBF / ( MTBF + MTTR )
• AHU - Air Handler unit
• BEU - Blade machines in Enclosure Unit ( 7 x CPU )
• BGP - border gateway protocol http://en.wikipedia.org/wiki/Border_Gateway_Protocol
  
• BPM - Business Process Management (a streamlined, holistic, continual-improvement style  ERP endevour, see: http://en.wikipedia.org/wiki/Business_process_management )
  
• Cabinet - a Rack with side, top and bottom panels that create an enclosed space
• CAR - Central Apparatus Room (or Central Machine Room) commonly found at broadcast facilities (see http://en.wikipedia.org/wiki/Central_apparatus_room )
• Chassis - an enclosure for conveniently mounting computer equipment in a Rack
• Context Analysis - http://en.wikipedia.org/wiki/Context_analysis
• COP - Coefficient of Performance, amount of heat removed for each unit of energy
  
• CPE - Compute Power Efficiency, ( IT Equipment Utilization / PUE ) a unitless percentage with target value of 1.0
• CPU - central processing unit (aka motherboard)
• CRAC - Computer Room Air-Conditioners
  
• CRAH - Computer Room Air-Handlers
• CSF Critical Success Factor - http://en.wikipedia.org/wiki/Critical_success_factor
• CVP - Cost-Volume-Profit
• DC - data center http://en.wikipedia.org/wiki/Data_center
• DCiE - Data Center Infrastructure Efficiency ( IT equipment power x 100 / Total facility power ) a percentage, target is infinity.
• DCP - Data Center Productivity (Useful Work Produced / Total Quantity of a Resource Consumed Producing this Work) a family of metrics DCxP.
• DCeP - Data Center energy Productivity (Useful Work Produced / Total Data Center Energy Consumed Producing this Work ) see thegreengrid.org
• DCUV - Data Center Utility Vault containing a server cluster and network node
• Enclosure - a large Chassis for containing computing equipment, such as CPUs and for mounting in a Cabinet or Rack
• EPU - Enclosed-rack (cabinet) Power Unit ( 1 EPU per BEU )
• ERP - Enterprise Resource Planning (see http://en.wikipedia.org/wiki/Enterprise_resource_planning and BPM / Six Sigma )
• Gap analysis - http://en.wikipedia.org/wiki/Gap_analysis
  
• HA - High Availability
  
• IDU - Incremental Deployment Unit ( 2 x RLU )
• ISO 20000 - an ITSM standard (see http://en.wikipedia.org/wiki/ISO_20000 )
• IT - Internet Technology
• ITEU - IT Equipment Utilization, has no clear definition of utilization as a measure of useful work.
• ITIL - Information Technology Infrastructure Library (see http://en.wikipedia.org/wiki/ITIL or alternately ITSM )
• ITSM - IT Service Management (as subset of ERP, see http://en.wikipedia.org/wiki/IT_Service_Management )
• KPI - Key Performance Indicator http://en.wikipedia.org/wiki/Key_performance_indicator
• kWh - kilowatt hours
• KVM - keyboard, video, and mouse
• LAN - Local Area Network
• NIC - Network Interface Card
• NSU - Network Switching Unit
• MSP - Managed Services Provider
• MTBF - Mean Time Between Failures
• MTTR - Mean Time To Replacement/repair
• NOC - Network Operations Center
  
• PD - Power Density (actual power used by computing equipment / the floor area occupied by the equipment)  Equipment space includes egress paths, AC equipment and PDU's, but not empty floor space.
• PDC - Power Density Capacity (total electric power capacity available to computing equipment (Watts) / total "raised floor" area (SF) of DC's computer room.
• PDU - Power Distribution Unit
• PUE - Power Usage Effectiveness ( Total facility power / IT equipment power  OR  1/DCiE ), ratio target is 1.0
• Rack - a standardized frame, usually 42RU (up to 45RU = 7ft) and 19inch wide, for mounting computer equipment, see http://en.wikipedia.org/wiki/19-inch_rack Telecommunications equipment sometimes uses Western Electric 23-inch standard width.  Seismic zone racks for Zone 4 are most secure. http://en.wikipedia.org/wiki/19-inch_rack#Four-_and_two-post_racks
• RAS Reliability, Availability, Serviceability
  
• RLU - Rack Location Unit (1 BEU + 1 EPU )
• ROI - Return On Investment
• RAID - Redundant Array of Independent Disks
• RU - Rack Unit (often abbreviated U), a unit that describes Chassis or Enclosure height ( 1U = 1.75 inches)
• SAN - Storage/system Area Network
• SC - Server Cluster
• Six Forces Model - http://en.wikipedia.org/wiki/Six_Forces_Model
  
• Six Sigma - a specific BPM process, see http://en.wikipedia.org/wiki/Six_Sigma
  
• SWOT - Strengths, Weaknesses, Opportunities, Threats more  at: http://en.wikipedia.org/wiki/Swot_analysis
• Targeted Cooling - practice of removing heat at the source, such as attaching vent hoods to cabinets instead of using CRACs
  
• TCO  - Total Cost of Ownership
• CMDB - Change Management Data Base, see ITIL
• UV - Utility Vault, see http://en.wikipedia.org/wiki/Utility_vault
• VLAN - virtual local area network
• WAN - wide area network