Download Dependable Computing for Critical Applications 2 by Sandro Bologna, Øivind Berg, Kjell Haugset, Jon Kvalem PDF

By Sandro Bologna, Øivind Berg, Kjell Haugset, Jon Kvalem (auth.), Prof. John F. Meyer, Prof. Richard D. Schlichting (eds.)

This quantity comprises the papers provided on the moment foreign paintings­ ing convention on responsible Computing for serious functions, backed through IFIP operating staff lOA and held in Tucson, Arizona on February 18-20, 1991. in response to the 1st such convention in this subject, which came about on the collage of California, Santa Barbara in 1989, this assembly was once like­ clever occupied with an enormous easy query: will we depend upon desktops? in additional specific phrases, it addressed numerous facets of laptop procedure de­ pendability, a vast idea outlined as th'e trustworthiness of laptop provider such that reliance can justifiably be put on this provider. on condition that this time period contains attributes equivalent to reliability, availability, defense, and defense, it's our wish that those papers will give a contribution to extra integration of those principles within the context of severe purposes. this system consisted of 20 papers and 3 panel periods. The papers have been chosen from a complete of sixty one submissions at a November 1990 assembly of this system Committee in Ann Arbor, Michigan. We have been very lucky to have a vast spectrum of pursuits represented, with papers within the ultimate application coming from seven various nations, representing paintings at universities, organizations, and executive firms. the method was once drastically facilitated by means of the diligent paintings of this system Committee and the standard of experiences supplied by way of open air referees. as well as the paper displays, there have been 3 panel classes or­ ganized to check specific themes in detail.

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Example text

This type of error is intended to model the changes in variables due to possible errors in memory and in data manipulation (ALU). The probability of a node failure during a checkpoint interval in our experiments, PI, is independent and constant. 1]. Each program is run five times for each failure probability. 4 Experiment Results Program Characteristics The overhead measures we considered consist of the checkpoint size (ckp_size), checkpointing time (ckp_time), and checkpoint comparison time (cmp_time).

The relative execution time increases significantly for high error rates due to file server activity during checkpointing and comparison of checkpoints. This suggests that either a reduction in checkpoint size, an increase in file system speed, or other noncentralized server implementations may improve the relative execution over that of our current implementation. The relative execution time fluctuates more for the day time condition than that for the night. The execution time is longer in the day runs than in the night (Figure 4).

Consider now the replicated object X represented on figure 2. It consists of two replicas A and B located on the same LAN segment and a third replica C on a second segment. Let us assume that the two LAN segments are linked by a gateway G. J Figure 2: Three Replicas on Two LAN Segments when the gateway G is operational. For all practical purposes, a failure of G will have the same effect as a failure of C. We propose therefore to replace the subsystem consisting of site C and its gateway G by an aggregate site C' that will remain operational as long as both C and G are operational.

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