A high-performance computer made for high-volume, processor-intensive computing. This term is used for the processor unit, including main storage, execution circuitry, and peripheral units, usually in a computer center, with extensive capabilities and resources to which other computers may be connected so they can share facilities
Glossary - M
This is a glossary of older terms. While many of the definitions are unchanged, some of the definitions may be out of date and some of the terms may no longer be in use in the Data Center industry. This legacy glossary provides definitions for hundreds of information and communications technology (ICT) and data center terms and acronyms. Arranged alphabetically and searchable, the glossary explains common industry vocabulary.
Mainframe
Managed Service Provider Data Center
This was the earliest form of outsourcing which occurred when companies hired AT&T, IBM, and HP. This has evolved and there are a number of managed services providers that let companies manage some, or all, of their data center functions. This is more typically handled by IT and Corporate Real Estate is seldom involved. Source: SOIR
Management Information Base (MIB)
A repository of information to describe the operation of a specific network device
Manifolds
A pipe or chamber branching into several openings, a component of liquid cooling solutions. Source: Oxford Languages
Material Compatibility
A material's resistance to corrosion, rust or stains when it comes in contact with a chemical, a parameter of evaluation for fluids used to cool data center equipment. Source: Setra
MBH
Heat release rate in units of 1000 British thermal units (BTU) per hour
Mean Time to Repair (or Recover) (MTTR)
The expected time to recover a system from a failure, usually measured in hours
Measured Power
The heat release in watts
Media Access Control (MAC)
The data link sub-layer that is responsible for transferring data to and from the physical layer
Megawatt (MW)
A unit of power equal to one million watts, especially as a measure of the output of a power station. Source: Oxford Languages
Megawatt-hour (Mwh)
A unit of electrical energy which equals one megawatt of power used for one hour. Source: Oxford Languages
Memory
A component type of data center class server. Source: Intel
Memory
Internal storage areas in the computer. The term memory identifies data storage that comes in the form of silicon, and the word storage is used for memory that exists on tapes or disks. The term memory is usually used as a shorthand for physical memory, which refers to the actual chips capable of holding data. Some computers also use virtual memory, which expands physical memory onto a hard disk
Memory Unit, Data Storage
A solid state item which accepts and systematically retains digital input data in such a manner as to facilitate the rapid recovery of the stored information. The item is a component of an electronic computer system. Excludes MAGNETIC DRUM, DATA STORAGE and CORE MEMORY UNIT. For portable solid-state memory, see MEMORY, PORTABLE, SOLID STATE. [ FIIG=A23900;INC=53510 || DLIS || ISO 22745-11 Source: eOTD ECCMA Open Technical Dictionary is an ISO 22745 compliant dictionary managed by ECCMA
Meter (m)
the SI unit of length. It is defined by taking the fixed numerical value of the speed of light in vacuum c to be 299 792 458 when expressed in the unit m s-1, where the second is defined in terms of ΔνCs. Source: BIPM
Metric
The final results of a benchmark. The significant statistics reported from a benchmark run. Each benchmark defines what are valid metrics for that particular benchmark
Micro Data Center
a data center that incorporate all of the essential components you find in a typical data center, but in a scaled down deployment. All components are enclosed within one standard IT rack with plenty of room to house your sensitive IT equipment, servers, and the rack accessories of your choice. Typically, micro data centers support critical loads of no more than 100-150 kilowatts (kW). Components within the rack usually include: • Uninterruptible power supply (UPS) • Rack power distribution unit (rPDU) • Rack cooling unit and climatic controls with integrated heat rejection • Remote monitoring sensors and software Some micro data centers also include backup fan systems, physical security, fire suppression systems, shock absorption, and power conditioning. Optional accessories can often be added to tailor the solution to your unique needs. For example, you may be able to include cable management tools, blanking panels, or airflow management solutions. Source: Vertivxvi
Microprocessor
A chip that contains a CPU. The terms microprocessor and CPU are quite often used interchangeably
Midplane
Provides a fault-tolerant connection from the blade server to the server chassis and other components. The midplane replaces an average of nine cables typically required in rack and pedestal server configurations, eliminating excessive cables
Minimum Efficiency Reporting Value (MERV)
Previously there were several specifications used to determine filter efficiency and characteristics. ASHRAE has developed the MERV categories so that a single number can be used to select and specify filters
Mist
Liquid droplets of a substance or mixture suspended in a gas (usually air). Source: United Nations GHS
Mixture
A solution composed of two or more substances in which they do not react. Source: United Nations GHS
MLC
Mechanical load component per ANSI / ASHRAE Standard 90.4 – 2016 is calculated by the sum of all cooling, fan, pump, and heat rejection annual energy use divided by the data center ITE energy (annualized MLC) or the sum of all cooling, fan, pump, and heat rejection design power divided by the data center ITE design power (design MLC). Source: ANSI
MMF
Multimode fiber
Motherboard
The main circuit board of a computer. The motherboard contains the CPU, BIOS, memory, input/output ports, expansion slots, connectors for attaching additional boards and peripherals, and the controllers required to control those devices
Motherboard
A component type of data center class server. Source: Intel
MTBF
Mean time between failure
MTCO2e
Metric Tons of carbon dioxide equivalent. Source: United States Environmental Protection Agency