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portability
The degree to which a software application can be easily moved from one
computing environment to another.
porting
Adapting a given body of code so that it will provide equivalent functions
in a computing environment that differs from the original implementation
environment.
power-down
The sequence of steps that stops the flow of electricity to a system or its
components.
power-up
The sequence of events that starts the flow of electrical current to a system or its
components.
primary cache
The cache memory that is the fastest and closest to the processor.
processor module
Module that contains the CPU chip.
program mode
The state in which the system console terminal is under the control of a program
other than the console program.
RAID
Redundant array of inexpensive disks. A technique that organizes disk data to
improve performance and reliability. RAID has three attributes:
It is a set of physical disks viewed by the user as a single logical device.
The user’s data is distributed across the physical set of drives in a defined
manner.
Redundant disk capacity is added so that the user’s data can be recovered
even if a drive fails.
redundant
Describes duplicate or extra computing components that protect a computing
system from failure.
Glossary–11
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