Accession Number:

AD0777166

Title:

A Comparison of Fault-Tolerant and Externally Redundant Computers,

Descriptive Note:

Corporate Author:

AEROSPACE CORP EL SEGUNDO CALIF

Personal Author(s):

Report Date:

1974-01-25

Pagination or Media Count:

42.0

Abstract:

The reliability of fault-tolerant and externally redundant computers is compared with reference to long-duration space missions. Technology, computer performance, and reliability assumptions are equal for all configurations. It is then found that the postulated fault-tolerant computer requires about four times the resources of an equivalent simplex design. An active and spares configuration and a voting configuration of four simplex computers are compared to the fault-tolerant computer. For mission durations of three years or longer the fault-tolerant design has a significant reliability advantage. For five-year missions the reliabilities are as follows Fault-tolerant 0.9530, Active and spares 0.4920, Voting 0.1918. Author

Subject Categories:

  • Computer Hardware
  • Manufacturing and Industrial Engineering and Control of Production Systems

Distribution Statement:

APPROVED FOR PUBLIC RELEASE