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Measurement and Analysis of Failures in Computer SystemsThis thesis presents a study of software failures spanning several different releases of Tandem's NonStop-UX operating system running on Tandem Integrity S2(TMR) systems. NonStop-UX is based on UNIX System V and is fully compliant with industry standards, such as the X/Open Portability Guide, the IEEE POSIX standards, and the System V Interface Definition (SVID) extensions. In addition to providing a general UNIX interface to the hardware, the operating system has built-in recovery mechanisms and audit routines that check the consistency of the kernel data structures. The analysis is based on data on software failures and repairs collected from Tandem's product report (TPR) logs for a period exceeding three years. A TPR log is created when a customer or an internal developer observes a failure in a Tandem Integrity system. This study concentrates primarily on those TPRs that report a UNIX panic that subsequently crashes the system. Approximately 200 of the TPRs fall into this category. Approximately 50% of the failures reported are from field systems, and the rest are from the testing and development sites. It has been observed by Tandem developers that fewer cases are encountered from the field than from the test centers. Thus, the data selection mechanism has introduced a slight skew.
Document ID
19970037324
Acquisition Source
Langley Research Center
Document Type
Thesis/Dissertation
Authors
Thakur, Anshuman
(Illinois Univ. Urbana-Champaign, IL United States)
Date Acquired
August 17, 2013
Publication Date
September 1, 1997
Subject Category
Computer Operations And Hardware
Report/Patent Number
NASA/CR-97-206187
NAS 1.26:206187
UILU-ENG-97-2222
CRHC-97-15
Accession Number
97N30824
Funding Number(s)
CONTRACT_GRANT: DABT63-94-C-0045
CONTRACT_GRANT: NAG1-613
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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