Mirror (computing)
General
A mirror site is a direct copy of another website for one of many purposes. A mirror site is a very common occurrence when downloading something off the internet. A perfect example of this is the well-known Source Forge.net site. The basis of the Sourceforge concept is, primarily, open source, but secondarily, the use of many different locations to achieve one goal: to get the product to the user, you. Many innovative and amazing computer projects host their sites and files on Source Forge, which provides mirrors in several states and countries; from Dublin, Ireland to Tokyo, Japan.
Mirroring sites also occurs:
- To protect data from a failure, usually in hardware. See disk mirror.\n* To combat censorship, and deception; while promoting freedom of information. For example: an activist might post pictures of a company conducting illegal activities or information on government activity and be litigated for such. Other internet users will post the content in question on other servers when the legal action results in the cancellation of ISP or DNS services for the original activist. (more examples decss)\n* To allow faster downloads for users in one area: for example, a US server could be mirrored in Japan, allowing Japanese Internet users to download content faster from the Japanese server than the American\n* To balance load - if one server is extremely popular a mirror may help relieve this load: for example if a Linux distribution is released as an ISO image onto the distribution producer's own server, this server may be overloaded with demand and so mirrors may help reduce the load off this main server.\n* As a temporary measure to counterbalance a sudden, temporary increase in traffic. For example, slashdotted websites will often be mirrored by a few slashdot posters until the article is pushed off the front page.\n* To keep historic content: economic reasons may prevent the maintainers of a server from keeping older and unsupported content for users who still may desire them - a mirror may be made to keep this content from disappearing\n* To increase a site's ranking in a search engine by placing hyperlinks to each mirror within each other mirror. This is viewed as unethical by most search engine administrators and websurfers.\n* Rarely, as a form of plagiarism. Usually pointless since a website popular enough to be worth plagiarizing will find out as soon as one of their many readers stumbles onto the plagiarized site. Generally regarded with the same amount of respect as other forms of plagiarism, possibly less.
History
Many sites have been mirrored in the past due to historical or social events.
- IsoNews - The warez-listing site was raided by the FBI on February 27th, 2003. Iso News supplied the release lists for warez games and programs, but did not actually supply said games and programs, or where to find them. In a bold move, the isonews site was redirected to the Department of Justice website instead. The justification given by the DOJ was that the site sold Xbox and Ps2 modchips, which is a clear lie, since the site merely had ads linking to mod sites. Out of frustration, www.stolemy.com was setup--"stole my," as in, "stole my isonews." There is another lesser-used mirror, www.theisonews.com\n*Google - When Google's website was banned in 2002 by China, the mirror Elgoog was set up to circumvent the ban. As it turns out, the regulators were trying to stop the use of Google's cache to visit sites that were already previously banned.
Programs
Programs like
HTTrack are automated
programs that mirror entire
sites for one's own personal use. This inreases load times.
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