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Software Fault Tolerance Techniques and Implementation phần 8

Sự khác nhau giữa kịch bản này và kịch bản thất bại trong loại màu xám. Kịch bản này là tương tự như kịch bản trước, ngoại trừ nguyên nhân của 2 thất bại ban đầu Â. â € ¢ Khi nhập cảnh để RTB, điều hành thực hiện như sau: một â € ™ 2 được thực hiện. Không có ngoại lệ hoặc thời gian ngoài xảy ra trong quá trình thực hiện - ¢ € Kết quả của 2 trình AT | Data Diverse Software Fault Tolerance Techniques 231 Table 5.6 lists several TPA issues indicates whether or not they are an advantage or disadvantage if applicable and points to where in the book the reader may find additional information. Some analysis has been performed on the TPA set of techniques see the performance section below but more research and experimentation is required before they can be used with confidence. The indication that an issue in Table 5.6 can be a positive or negative - influence on the technique or on its effectiveness further indicates that the issue may be a disadvantage in general e.g. cost is higher than nonfault-tolerant software but an advantage in relation to another technique. In Table 5.6 Two-Pass Adjudicator Issue Summary Issue Advantage Disadvantage - Where Discussed Provides protection against errors in translating requirements and functionality into code true for software fault tolerance techniques in general Chapter 1 Does not provide explicit protection against errors in specifying requirements true for software fault tolerance techniques in general - Chapter 1 General backward and forward recovery advantages Sections 1.4.1 1.4.2 General backward and forward recovery disadvantages - Sections 1.4.1 1.4.2 General design and data diversity advantages Sections 2.2 2.3 General design and data diversity disadvantages - Sections 2.2 2.3 DRA - Sections 2.3.1-2.3.3 Similar errors or common residual design errors - Section 3.1.1 Coincident and correlated failures - Section 3.1.1 CCP - Section 3.1.2 Space and time redundancy - Section 3.1.4 Design considerations Section 3.3.1 Dependable system development model Section 3.3.2 Dependability studies - Section 4.1.3.3 Voters and discussions related to specific types of voters - Section 7.1 232 Software Fault Tolerance Techniques and Implementation these cases the reader is referred to the noted section for discussion of the issue. 5.3.4.1 Architecture We mentioned in Sections 1.3.1.2 and