By Igor Schagaev, Thomas Kaegi-Trachsel (auth.)
This publication addresses the query of ways method software program might be designed to account for faults, and which fault tolerance positive factors it may offer for maximum reliability. The authors first convey how the method software program interacts with the to tolerate faults. They research and additional enhance the idea of fault tolerance to appreciate the various how one can raise the reliability of a approach, with unique cognizance at the function of method software program during this approach. They additional increase the final set of rules of fault tolerance (GAFT) with its 3 major techniques: checking, instruction for restoration, and the restoration process. for every of the 3 methods, they examine the necessities and homes theoretically and provides attainable implementation situations and process software program help required. in response to the theoretical effects, the authors derive an Oberon-based programming language with direct aid of the 3 approaches of GAFT. within the final a part of this ebook, they introduce a simulator, utilizing it as an evidence of inspiration implementation of a singular fault tolerant processor structure (ERRIC) and its newly constructed runtime process feature-wise and performance-wise. The content material applies to industries corresponding to army, aviation, extensive future health care, commercial keep an eye on, area exploration, and so on.
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Additional info for Software Design for Resilient Computer Systems
Different redundancy schemes have different properties, depending on which level (instruction, procedure, module, tasks, system) they are implemented. We show that as a general guideline, faults should be tolerated as fast and local as possible (ASAP and ALAP), favoring therefore the instruction level for the majority of malfunctions. We extensively covered the three main processes of GAFT. For testing and checking, we showed that the combination of hardware- and software-based checking is the most efficient approach: • Hardware-based checking process works well for covering short-time malfunctions; • Software-based checking of hardware for latent malfunctions and permanent errors.
9) This success function SF defines the recovery rate. A duplicated system can detect all possible malfunctions and if self-checking is implemented, it can also recover from them. Thus, a success function should meet the following constraints, with x being the amount of used redundancy: • The recovery rate must be in the range of 0–1; • If no redundancy is used x = 0, the chance for recovery is 0, therefore SF → 0. If duplication is used x = 1, the recovery is in approximation 1, therefore SF → 1; • If more redundancy than duplication is used (x > 1), the system gets less efficient.
Proving that the fault did not affect the software state or excluding the effects of the fault if it had an impact. It is also necessary to make the system aware of a new 26 4 Generalized Algorithm of Fault Tolerance (GAFT) possible hardware topology, in the case that a HW component failed and could not be recovered. In addition, the system must create recovery points that can then be used to roll back program execution to eliminate the effects of the fault and resume communication. We believe that this step of recovery point creation is also part of GAFT as a separate (concurrent) process to the standard GAFT) process.
Software Design for Resilient Computer Systems by Igor Schagaev, Thomas Kaegi-Trachsel (auth.)