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mir·ror

(mir'ŏr),
A polished surface reflecting the rays of light reflected from objects in front of it.
[Fr. miroir, fr. L. miror, to wonder at]
noun An archiving device written to more than one hard disk simultaneously, so that if one disk fails, the computer continues to function without loss of data
verb To maintain an exact copy of a file or database

mirror

Informatics noun An archiving device written to more than one hard disk simultaneously, so that if one disk fails, the computer continues to function without loss of data verb To maintain an exact copy of a file or database. See FTP, Web Paranormal See Mind mirror.

mir·ror

(mir'ŏr)
A polished surface reflecting the rays of light reflected from objects in front of it.

mirror

A surface capable of reflecting light rays and forming optical images. Such surfaces are smooth or polished, made of highly polished metal, or a thin film of metal (e.g. aluminium) on glass, quartz or plastic. Object distance l and image distance l′ relate to the focal distance f or the radius of curvature r of the mirror, as follows
2/r represents the refractive power of the mirror, in air. If the medium that contains the incident and reflected rays is n, the power becomes F = 2n/r and the focal length, f = r/2n (Fig. M12). See focal length; fundamental paraxial equation; catadioptric system.
back surface mirror A mirror which reflects from the back surface of a refracting layer, usually glass. See front surface mirror.
concave mirror A mirror with a spherical concave surface forming an erect, magnified, virtual image when the distance from the mirror is less than the focal distance and an inverted real image when the object distance is greater than the focal distance (Fig. M12).
convex mirror A mirror with a spherical convex surface forming a virtual, erect and diminished image (Fig. M12).
front surface mirror A mirror that reflects directly from its front surface. The advantages of this type are that, unlike back surface mirrors, there is no chromatic effect as the glass is not used optically, therefore ultraviolet rays can be used which would otherwise be absorbed in the glass and there is no ghost reflection from the front surface. However, these mirrors can be easily scratched and the coating may tarnish. Often a coating of silicon monoxide is evaporated on top of the surface, but this causes a loss of reflectivity. See ghost image; back surface mirror.
plane mirror A mirror whose surface is plane and forms a virtual image of the same size as the object. Object and image distances are equal.
semi-silvered mirror See beam splitter.
mirror writing Writing backward, Latin letters being written from right to left and the details of the letters reversed. The writing thus appears normal when viewed in a mirror. Syn. retrography.
Fig. M12 Image of an object O formed in A, a concave mirror and B, a convex mirror. Four rays are drawn in each case for completeness, but two would suffice (C, centre of curvature; F ′, focal point; f ′, focal length; l and l ′, object and image length; r , radius of curvature)enlarge picture
Fig. M12 Image of an object O formed in A, a concave mirror and B, a convex mirror. Four rays are drawn in each case for completeness, but two would suffice (C, centre of curvature; F′, focal point; f′, focal length; l and l′, object and image length; r, radius of curvature)

mir·ror

(mir'ŏr)
A polished surface reflecting the rays of light reflected from objects in front of it; particularly useful in visualizing structures in the oral cavity.
References in periodicals archive ?
As you can see, using a mirrored SATA approach to data protection brings a number of immediate benefits for storage professionals, including:
* Having backup information immediately accessible from the mirrored SATA drive, without the need for lengthy rebuilds
As you assemble the necessary features and functionalities needed to create mirrored SATA solutions for corporate environments, the following characteristics of enterprise-class storage solutions that have returned value and cost savings to large and small data centers will prove useful in selecting SATA solutions for larger roles in your data center.
This independence allows them to perform "any-to-any mirroring," where data can be mirrored from any device, to any device, at any location.
In addition, data can typically only be mirrored to an identical storage device from the same vendor, limiting the ability to use less expensive devices at remote locations.
The iSCSI switch provides an alternative solution that enables companies to use any system from any vendor to create the redundant mirrored partner.
Using iSCSI virtualizationsoftware, mirrored partner volumes are defined from the local and remote storage system(see Figure 2).
SAN-based mirroring enhances availability by providing multiple paths to the mirrored data.
Generating backups from the mirrored data allows the process to proceed on a flexible schedule, but also introduces a point of vulnerability.
RAID-1+0 (mirrored striping): Requires three or more drives.
RAID-1 (JBOD mirroring): If one disk in the mirror fails, no data is lost; however, simultaneous loss of both mirrored disks results in data loss.
* Drive failover: In Fig 3, you will see that the, drives are mirrored to ensure data protection.