Term
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Definition
An element, object, or part of a system that, if it fails, will
cause the whole system to fail. |
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Term
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Definition
| Means that there is an unexpected increase in the amount of voltage provided. |
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Term
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Definition
A short transient in voltage that can be due to a short circuit, tripped circuit
breaker, power outage, or lightning strike. |
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Term
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Definition
| An unexpected decrease in the amount of voltage provided. |
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Term
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Definition
When the voltage drops to such an extent that it typically causes the
lights to dim and causes computers to shut off. |
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Term
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Definition
| When a total loss of power for a prolonged period occurs. |
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Term
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Definition
An enclosure that contains two complete power supplies,
the second of which turns on when the first fails. |
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Term
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Definition
Uninterruptible Power Supply
Takes the functionality of a surge suppressor and combines that with a battery backup, protecting computers not only from surges and spikes, but also from sags, brownouts, and blackouts. |
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Term
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Definition
Part of an emergency power system used when there is an outage
of regular electric grid power. |
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Term
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Definition
Systems that turn on automatically within seconds of a power
outage. |
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Term
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Definition
Redundant Array of Independent Disks 1
Mirroring. Data is copied to two identical disks. If one disk fails, the other continues to operate. |
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Term
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Definition
| When each disk is connected to a separate controller. |
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Term
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Definition
Redundant Array of Independent Disks 5
Striping with Parity. Data is striped across multiple disks; fault tolerant parity data is also written to each disk. |
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Term
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Definition
Secondary connections to another ISP; for example, a backup T-1
line. |
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Term
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Definition
| Two or more servers that work with each other. |
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Term
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Definition
Also known as high-availability clusters, these are designed so that
a secondary server can take over in the case that the primary one fails, with limited
or no downtime. |
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Term
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Definition
When multiple computers are connected in an attempt to
share resources such as CPU, RAM, and hard disks. |
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Term
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Definition
A near duplicate of the original site of the organization, complete with
phones, computers, networking devices, and full backups. |
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Term
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Definition
This will have computers, phones, and servers, but they might require
some configuration before users can start working on them. |
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Term
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Definition
This has tables, chairs, bathrooms, and possibly some technical setup, for
example, basic phone, data, and electric lines, but will require days if not weeks to
set up properly. |
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Term
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Definition
| Type of backup where all the contents of a folder are backed up. |
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Term
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Definition
Type of backup that backs up only the contents of a folder that
have changed since the last full backup. |
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Term
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Definition
Type of backup that backs up only the contents of a folder
that have changed since the last full backup or the last incremental backup. |
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Term
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Definition
A backup rotation scheme in which ten backup tapes are used
over the course of two weeks. |
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Term
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Definition
A backup rotation scheme in which three sets of backup
tapes must be defined—usually they are daily, weekly, and monthly, which correspond
to son, father, and grandfather. |
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Term
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Definition
A backup rotation scheme based on the mathematics of the Towers
of Hanoi puzzle. Uses three backup sets. For example, the first tape is used every
second day, the second tape is used every fourth day, and the third tape is used every
eighth day. |
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Term
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Definition
A plan that details the policies and procedures concerning
the recovery and/or continuation of an organization’s technology infrastructure. |
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Term
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Definition
The examination of critical versus noncritical functions,
it is part of a business continuity plan (BCP). |
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Term
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Definition
Recovery Point Objectives
In business impact analysis, the acceptable latency of data. |
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Term
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Definition
Recovery Time Objectives
In business impact analysis, the acceptable amount of time to restore a function. |
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