S - Definitions
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S
S/390
S/390 is IBM's large server (or mainframe) line of computer systems, which are marketed to the world's Fortune 1000 and many mid-size companies as a "tried-and-true" system with a history that stretches back to the System/360 of the early 1960s.
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scalability
It is the ability of a computer application or product (hardware or software) to continue to function well as it (or its context) is changed in size or volume in order to meet a user need.
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screen scraping
Screen scraping is the act of copying information that shows on a digital display so it can be used for another purpose.
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SELinux (Security-Enhanced Linux)
SELinux, or Security-Enhanced Linux, is a part of the Linux security kernel that acts as a protective agent on servers.
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server blade
A server blade is a thin, modular electronic circuit board containing one, two, or more microprocessors and memory, that is intended for a single, dedicated application (such as serving Web pages) and that can be easily inserted into a blade server, which is a space-saving rack with many similar servers. One product offering, for example, makes it possible to install up to 280 blade server modules vertically in multiple racks or rows of a single floor-standing cabinet. Blade servers, which share a common high-speed bus, are designed to create less heat and thus save energy costs as well as space.
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server consolidation
Server consolidation is an approach to the efficient usage of computer server resources in order to reduce the total number of servers or server locations that an organization requires.
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server sprawl
Server sprawl is a situation in which multiple, under-utilized servers take up more space and consume more resources than can be justified by their workload.
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shell
Shell is a UNIX term for the interactive user interface with an operating system.
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shell script
A shell script is a text file that contains a sequence of commands for a UNIX-based operating system.
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single point of failure (SPOF)
A single point of failure (SPOF) is a potential risk posed by a flaw in the design, implementation or configuration of a circuit or system in which one fault or malfunction causes an entire system to stop operating.
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SMP (symmetric multiprocessing)
SMP (symmetric multiprocessing) is the processing of programs by multiple processors that share a common operating system and memory.
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software-defined everything (SDE)
Software-defined everything (SDE) is an umbrella term that describes how virtualization and abstracting workloads from the underlying hardware can be used to make information technology (IT) infrastructures more flexible and agile.
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statistical mean, median, mode and range
Calculating the mean, median, mode and range of a set of numbers allows you to track changes over time and set acceptable ranges and variance. Here's how to find your data's mean, median, mode or range, and what it tells you.
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supervisor call (SVC)
In computers, especially IBM mainframes, a supervisor call (SVC) is a processor instruction that directs the processor to pass control of the computer to the operating system's supervisor program.
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SuperZap
SuperZap is an IBM utility program used to install zaps or fixes to MVS operating systems or application program code that is causing a problem.
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SuSE
SuSE (pronounced soo'-sah) is a German Linux distribution provider and business unit of Novell, Inc.
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SUSE Linux Enterprise Server (SLES)
SUSE Linux Enterprise Server (SLES) is a Linux-based server operating system created and maintained by the German-based organization, SUSE.
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SUSE Manager
SUSE Manager is an open source infrastructure management tool for Linux systems.
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sysplex and Parallel Sysplex
A sysplex is IBM's systems complex (the word sysplex comes from the first part of the word system and the last part of the word complex), introduced in 1990 as a platform for the MVS/ESA operating system for IBM mainframe servers.
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Systems Network Architecture (SNA)
SNA is a proprietary IBM architecture and set of implementing products for network computing within an enterprise.