The creation of a mirror image of data to be preserved in the event of disk failure.
Replicating data on different computers or devices to provide backup or improved performance. In a storage sense, "mirroring" refers to duplicating data on multiple disk storage devices to provide backup in the event of a system failure. In an Internet sense, "mirroring" refers to replicating the contents of a Web site at another site to minimize load on the main server, or to speed up connectivity in a specific geographic region.
A type of data redundancy that uses a set of physical drives to store data and one or more sets of additional drives to store duplicate copies of the data. Mirroring is the preferred data redundancy technique in lower-capacity systems and in systems where performance is extremely important. See also guarding, RAID 1, and RAID 10.
A storage array that contains two or more copies of identical data. This is also known as remote mirroring or RAID 1.
Writing data to two or more disk drives at the same time. In DiskSuite, mirrors are logical storage objects that copy their data to other logical storage objects called submirrors.
A method for data redundancy that maintains two or more identical, dynamic, real-time copies of data on separate disks. Mirroring is transparent to the host, which perceives a single volume.
Duplicating data on two array disks. Mirroring provides data redundancy by using a copy (mirror) of the RAID group to duplicate the information contained in the RAID group. The mirror is located on a different array disk. If one of the array disks fails, the system can continue to operate using the unaffected disk. Both drives contain the same data at all times. Either drive can act as the operational drive.
A layout technique that mirrors the contents of a volume onto multiple plexes. Each plex duplicates the data stored on the volume, but the plexes themselves may have different layouts.
This is a popular term used in RAID-1 configurations. A method of creating disc-fault tolerance by redundantly storing information on a pair of drives.
A technique where data is written to two (or more) disks simultaneously, with the intention of enabling data retrieval even when one of the disks falls.
A type of data redundancy in which a set of physical drives stores data and one or more sets of additional drives stores duplicate copies of the data. Mirroring functionality is provided by software. See also guarding, integrated mirroring, striping, and RAID.
The process of writing the same data to multiple disks at the same time. Mirroring data protects against data loss within the database or the recovery log.
The complete duplication of data on one disk drive to another disk drive, this duplication occurs simultaneously with each write operation.
Creating an exact mirror data copy.
A method of data backup that allows all of the data transactions to the primary hard disk drive to be copied and maintained on a second identical drive in near real time. If the primary disk drive fails or becomes disabled, all of the data stored on it (up to 1.2 billion bytes of information) is accessible on the second mirrored disk drive.
The process of making exact replicas of resource items, such as web pages, with slight modifications to hyperlinks as needed to reproduce the behavior of the items. This is similar to using the "save as" function from a browser to save a local copy of the page, including its contents and images.
Maintaining identical copies of data on one or more disks. Typically, mirroring is performed on duplicate hard disks at the operating system level, so that if one of the disks becomes unavailable, the other disk can continue to service requests without interruptions. When mirroring files, Oracle writes once while the operating system writes to multiple disks; when multiplexing files, Oracle writes the same data to multiple files.
Mirroring indicates that the services requested for the primary access card (first one installed) should be exactly copied for another access card on the same account. When a service is installed or disconnected on the primary access card, the same action is reflected on the mirrored access card.
An arrangement, by which, changes to one storage device are automatically duplicated on a similar device. For example, a disk can be set up as a mirror of another disk so that all writes to one disk are also automatically written to the other, allowing for recovery from media failure. Mirrored disks are an alternative to a RAID configuration. Needs Analysis An evaluation of current Help Desk performance to determine what changes should be made. The scope of the analysis should be determined by the mission statement.
Duplicating the data on one drive on the same data path (i.e., using the same MBA, cable, and terminator) for data redundancy. See also "Duplexing".
a method of storage in which data from one disk is duplicated on another disk so that both drives contain the same information, thus providing data redundancy.
The technique of writing the same data to separate logical or physical disks at the same time with no loss in speed, the same as writing to one disk alone. If one disk fails, the data is still available on the mirror-copy disk. The DG/UX operating system supports mirroring at the Logical Disk Level and at the hardware level in HADA and CSS2 disk systems.
A form of RAID where two or more identical copies of data are kept on separate disks. Used in RAID 1.
Provides data protection by duplicating all data from a primary drive on a secondary drive.
A popular term for RAID-1. A method of creating disk-fault tolerance by redundantly storing information on pairs of drives.
Process by which data is duplicated on separate disk systems. Benefits include faster access and fault tolerance in case of a disk system failure.
A data redundancy technique in which data is recorded identically and simultaneously on multiple separate disks. When the primary disk is off-line, the alternate takes over, providing continuous access to data. Defined as RAID 1 configuration.
The duplication of data for purposes of backup or to d istribute network traffic among several computers with identical data.
A form of RAID in which the Array Management Function maintains two or more identical copies of data on separate disks. Also known as RAID Level 1 and disk shadowing
Maintaining identical copies of data on different disks, which provides high data availability and improves disk read performance. Mirroring is also known as RAID 1.
The process of providing complete redundancy using two disk drives, by maintaining an exact copy of one disk drive's data on the second disk drive. If one disk drive fails, the contents of the other disk drive can be used to maintain the integrity of the system and to reconstruct the failed drives.
Creating an exact duplicate copy in real-time
The process of storing the same data on two chunks simultaneously, so that if one chunk fails, the data on the other chunk is still usable.
Also known as RAID 1 or duplexing (when using two host bus adapters). Full redundancy is obtained by duplicating all data from a primary disk on a secondary disk. The overhead of requiring 100 percent data duplication can get costly when using more than two drives.
The maintenance of a Web site that is a replica of an already existing site, used to reduce network traffic (hits on a server) or improve the availability of the original site. Mirror sites are useful when the original site generates too much traffic for a single server to support. Mirror sites also increase the speed with which files or Web sites can be accessed: users can download files more quickly from a server that is geographically closer to them. For example, if a busy New York-based Web site sets up a mirror site in England, users in Europe can access the mirror site faster than the original site in New York. Sites such as Netscape that offer copies or updates of popular software often set up mirror sites to handle the large demand that a single site may not be able to handle.
A data protection method in which a backup storage device maintains data identical to that on the primary device, thus serving as a backup in case the primary unit fails.
A technique used with hard drive arrays where the data on each drive is duplicated on a mirrored (or exact copy) drive.
