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صورة:Red pog2.svg

Red_pog2.svg‏ (ملف إس في جي، أبعاده 64 × 64 بكسل، حجم الملف: 607 بايت)


Summary

Description

Shiny red button/marker widget. Used to mark the location of something. Size/width 64x64px, but often displayed as 8x8 pixel size. This is a copy of Image:Red_pog.svg (used in many thousands of links) to provide planned redundancy for avoiding single-point-of-failure problems (due to image cache, vandalism, etc.). See below: Issues.
Source

Copy of Wikimedia Commons file: Image:Red_pog.svg.
Date

16-September-2007
Author

User:Wikid77 (copied source for fail-over redundancy).
Permission
(Reusing this image)

(see below)
Other versions Redundant copy (with over 10,000 links): Image:Red_pog.svg.

Licensing

Public domain I, the copyright holder of this work, hereby release it into the public domain. This applies worldwide.

In case this is not legally possible:
I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.

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Issues

The red-dot image is used (or actually, transcluded) into over 10,000 articles on the English Wikipedia alone. That makes the image an access bottleneck, in case of updates, or an easy target for wide-ranging vandalism. In configuration-management practices, an easy solution is to maintain redundant copies. The most obvious use of the redundancy practice is in the US NASA space program, such as duplicating the entire Mission-Control Room (MOCR) on the 2nd and 3rd floors of Mission Control; in the 1990s similar redundancy was achieved by allowing Shuttle control from either JSC (Houston) or KSC (Florida).

On September 15-18, 2007, image-cache problems had periodically prevented the display of the original image (Image:Red_pog.svg), but not of similar image files, such as Red_pog2.svg.

Another example of forced redundancy is in common utility routines, such as component calculations for commercial loan origination (involving up to 18 independent variables or more), where testing of altered loan calculations can be reduced into isolated sets, by using redundant copies of component calculations: only those loan or mortgage types using an updated copy would need to be extensively tested to ensure accuracy of mortgage payments and insurance premiums. Other copies could be updated at a future negotiated time, or left as documented variations, to control impact across the vast complexity of financial calculations.

Redundancy of image files can be simple to manage, if the few variations are cross-checked, as needed. The bottleneck or target problems can be reduced, with minimal maintenance overhead.

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