H - Definitions
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H
hard drive overwriter
In e-cycling, a hard drive overwriter is a program or utility that repeatedly overwrites the data on a computer's hard drive with gibberish.
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hardware clustering
Hardware clustering (sometimes called operating system clustering) is a hardware-based method of turning multiple servers into a cluster (a group of servers that acts like a single system).
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Heartbeat
Heartbeat is a program that runs specialized scripts automatically whenever a system is initialized or rebooted. Originally designed for two-node Linux-based clusters, Heartbeat is extensible to larger configurations... (Continued)
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high availability (HA)
High availability (HA) is the ability of a system or system component to be continuously operational for a desirably long length of time.
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High Level Assembler (HLASM)
High Level Assembler (HLASM) is IBM's assembler programming language and the assembler itself for the IBM z/OS, z/VM, OS/390, MVS, VM, and VSE operating systems. Released in June 1992, HLASM was the first new assembler language from IBM in twenty years. Version 4 was released in September 2000.
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high-performance computing (HPC)
High-performance computing (HPC) is the use of parallel processing for running advanced application programs efficiently, reliably and quickly. The term applies especially to systems that function above a teraflop or 1012 floating-point operations per second... (Continued)
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Hot spot/cold spot
A hot spot/cold spot is an undesirable tightly-focused local temperature variation which often occurs when data center equipment is improperly cooled.
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hot/cold aisle
Hot aisle/cold aisle is a layout design for server racks and other computing equipment in a data center. The goal of a hot aisle/cold aisle configuration is to conserve energy and lower cooling costs by managing air flow.
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HP 9000
The HP 9000 is a line of UNIX-based business servers from Hewlett-Packard (HP) with server models that span enterprise applications from the "entry-level" (branch or department-level computers, Web hosting servers, and so forth) through the midrange with needs for handling advanced enterprise resource planning (ERP) and analytical customer resource management (CRM) up to its high-end servers for very computing-intensive applications.
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HP-UX
HP-UX is the UNIX-based operating system for the HP 9000 series of business servers from Hewlett-Packard.
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HVAC (heating, ventilation, and air conditioning)
HVAC stands for heating, ventilation, and air conditioning.
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hydrofluorocarbon (HFC) clean agent
Data centers and telecom rooms use hydrofluorocarbon (HFC) clean agent systems for fire protection to avoid damaging electrical and electronic equipment.