U - Definitions
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U
U (measurement)
A U is a standard unit of measure for designating the height in computer enclosures and server rack cabinets.
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Ubuntu
Ubuntu (pronounced oo-BOON-too) is a free, open source operating system (OS) based on Debian Linux.
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unified computing system (UCS)
A unified computing system (UCS) is a converged data center architecture that integrates computing, networking and storage resources to increase efficiency and enable centralized management.
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uninterruptible power supply (UPS)
An uninterruptible power supply (UPS) is a device that allows a computer to keep running for at least a short time when incoming power is interrupted.
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Unix
Unix -- trademarked as UNIX -- is a multiuser, multitasking operating system (OS) designed for flexibility and adaptability.
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Uptime Institute's data center tier standards
Data center tiers are a system created by Uptime Institute LLC to describe the availability of infrastructure resources in a facility.
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utility computing
Utility computing is a service provisioning model where a provider makes computing resources, infrastructure management and technical services available to customers as they need them.