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Top Forums UNIX for Dummies Questions & Answers why need to mirror disk if we had backups ? Post 302186426 by cero on Thursday 17th of April 2008 07:51:21 AM
Old 04-17-2008
Mirroring keeps your server alive when a disk fails.
Backups keep your company alive in case of a disaster.

With backups you can recover from logical errors, maybe a user deleting a business critical file - mirroring cant help you here.

Business critical servers need both: service continuity (mirroring) in case of a disk failure and business continuity (backup) in case you lose the entire server.
 

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JIGDO-MIRROR(1) 														   JIGDO-MIRROR(1)

NAME
jigdo-mirror - Maintain a mirror of images offered with jigdo SYNOPSIS
jigdo-mirror [ config-file ] DESCRIPTION
See jigdo-file(1) for an introduction to Jigsaw Download. jigdo-mirror is a script intended for people who want to offer direct HTTP or FTP downloads of files for which only the jigdo and template files are available. As the first step of using jigdo-mirror, you need to set up normal HTTP/FTP/rsync mirroring both of the `.jigdo'/`.template' files and of the parts that are needed for the reconstruction of the images. For example, in the case that you want to mirror Debian CD images with jigdo-mirror, you need a mirror of the `.jigdo'/`.template' files and a Debian mirror on the local machine. At regular intervals (preferably immediately after the normal mirroring has finished), schedule a run of jigdo-mirror. It will search through a given directory for any `.jigdo' files and attempt to create all images offered by each file. The script requires you to set a number of variables - please refer to the start of /usr/bin/jigdo-mirror for a description of each of them. Since /usr/bin/jigdo-mirror will be overwritten whenever you upgrade jigdo-mirror, it is highly recommended not to change the set- tings directly in this script. Instead, personal settings should be saved in a file called .jigdo-mirror in your home directory, or in a different file whose name is then passed to the script as its first (and only) command line argument. SEE ALSO
jigdo-file(1), jigdo-lite(1) CD images for Debian Linux can be downloaded with jigdo <URL:http://www.debian.org/CD/jigdo-cd/>. AUTHOR
Jigsaw Download <URL:http://atterer.net/jigdo/> was written by Richard Atterer <jigdo atterer.net>, to make downloading of CD ROM images for the Debian Linux distribution more convenient. 19 May 2006 JIGDO-MIRROR(1)
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