By Topic

A Highly Efficient Redundancy Scheme: Self-Purging Redundancy

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$33 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

1 Author(s)
Losq, J. ; Digital Systems Laboratory, Department of Electrical Engineering and Department of Computer Science, Stanford University

The goals of this paper are to present an efficient redundancy scheme for highly reliable systems, to give a method to compute the exact reliability of such systems and to compare this scheme with other redundancy schemes. This redundancy scheme is self-purging redundancy, a scheme that uses a threshold voter and that purges the failed modules. Switches for self-purging systems are extremely simple: there is no replacement of the failed modules and module purging is quite simply implemented. Because of switch simplicity, exact reliability calculations re possible. The effects of switch reliability are quantitatively examined. For short mission times, switch reliability is the most important factor: self-purging systems have a probability of failure several times larger than the figure obtained when switches are assumed to be perfect. The influence of the relative frequency of the diverse types of failures (permanent, intermittent, stuck-at, multiple,...) is also investigated. Reliability functions, mission time improvements, and switch efficiency are computed and displayed. Self-purging systems are compared with other redundant systems, like hybrid or NMR, for their relative merits in reliability gain, simplicity, cost, and confidence in the reliability estimation. The high confidence in the reliability evaluation of self-purging systems makes them a standard for the validation of several models that have been proposed to take into account switch reliability. The accuracy of the models using coverage factors can be evaluated in this way.

Published in:

Computers, IEEE Transactions on  (Volume:C-25 ,  Issue: 6 )