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IT Fundamentals - Chapter 34
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Business continuity The ability of an organization to maintain its operations and services in the face of a disruptive event.
Fault tolerance The ability of a system to continue performing when some part of the system has failed, such as when there is a hardware failure.
Replication The act of copying information between devices so that if the primary device fails, another device can take over for it.
Terms in this set (30) Hide definitions
Redundancy A feature of an IT system so that it can continue to function even if a major component fails because all components are duplicated and designed to switch over automatically to the secondary components in case of failure.
Data redundancy The duplication of data, or the storage of the same data in multiple places to achieve fault tolerance. This might include high availability databases, RAID arrays and backups.
Network redundancy Multiple connections and duplicate components in a network, so that the network still operates even with a hardware failure or lost connection. This might require duplicate routers and switches, with each router connected to a different wide area network (WAN).
RAID (redundant array of independent disks) A configuration of multiple hard drives to store data. It can use striping to increase logical volume size and improve performance, or mirroring to ensure that if one hard drive fails the data is still available from another hard drive.
RAID 0 (striping) A RAID configuration that uses space from two or more physical disks to increase the disk space available for a single volume. Performance improves because data is written evenly across all disks, but there is no redundancy.
RAID 1 (mirroring) A type of RAID array that duplicates data on one drive to another drive and is used for fault tolerance. Also called mirrored volume.
File backup Backing up the information created by application software, such as documents, spreadsheets, photographs, videos and so on. This type of data can be backed up using several methods.
File synchronization A method for backing up data by copying any additions, changes, or deletions made on one storage device (the original location) to another local, network or cloud storage device.
File copying A method for backing up data by copying files from the original location to another location by the operating system's built-in copy commands.
File history A method for backing up data where files are copied to another location in such a way that different versions of the same file can be restored when desired. Also, the Microsoft Windows program that does this type of backup.
Critical data Data that is used in the day-to-day operation of a company or organization; the data required to get the job done. It needs to be backed up, available to use and available to restore when needed.
Hierarchical storage management Technology that combines high-speed hard drives for newer critical data with low-speed, cheaper storage for older, less important data. Transfer of aged data to slower storage is automated to provide a cost effective storage solution.
Database backup A backup that includes data files, relationships, SQL statements and transaction logs done from application menus and commands within Oracle and SQL Server DBMS.
OS (operating system) backups Disaster recovery backups that enable crashed systems to be returned to use quickly or migrated to new hardware. They should include the OS, apps and settings.
Local backup An onsite backup located within the organization's premises. With the backup media nearby, data can be restored quickly when needed.
Cloud storage backup A backup to a remote data center through an internet connection. It runs continuously whenever the device is connected to the internet.
Off-site backup A backup where the data is stored at a different location from the local premises.
Contingency Plan A plan for keeping IT running in the event of any type of interruption. Some elements of the plan include backup information, replacement systems, accounts and customer information.
