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基于Z語(yǔ)言和貝葉斯網(wǎng)絡(luò )的存儲系統可靠性評估方法
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江蘇省南京市南京航空航天大學(xué)

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TP309

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國家自然科學(xué)基金項目(面上項目,重點(diǎn)項目,重大項目)


Memory System Reliability Evaluation Model Based on Z and Bayesian Network
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    摘要:

    現有的存儲系統可靠性評估方法難以動(dòng)態(tài)地描述其可靠性特征,也難以反映其與時(shí)間的關(guān)系;針對此問(wèn)題,提出了一種結合Z語(yǔ)言、連續時(shí)間馬爾科夫鏈以及貝葉斯網(wǎng)絡(luò )的可靠性評估方法;該方法將存儲系統抽象為兩級,分為功能單元和存儲系統整體兩部分;在針對功能單元進(jìn)行可靠性評估時(shí),建立了一種基于Z語(yǔ)言的可靠性模型,由于其關(guān)于時(shí)間的狀態(tài)轉移符合Markov鏈的性質(zhì),因此引入連續時(shí)間馬爾科夫鏈進(jìn)行評估;為了更清晰地表達存儲系統與各個(gè)功能單元之間的多狀態(tài)關(guān)系,構建了功能單元失效率與存儲系統整體失效率之間的貝葉斯網(wǎng)絡(luò );基于貝葉斯網(wǎng)絡(luò )計算出存儲系統的整體可靠性,并得到其可靠性關(guān)鍵模塊;最后,通過(guò)實(shí)例分析與計算表明,基于提出的可靠性評估方法能夠準確描述存儲系統的狀態(tài)轉移,可以量化計算存儲系統的可靠性,得到其可靠度,具有一定的實(shí)用價(jià)值。

    Abstract:

    The existing reliability evaluation methods of storage systems are difficult to describe its reliability characteristics dynamically, and it is difficult to reflect its relationship with time. To solve this problem, a method combining Z language, continuous-time Markov chain and Bayesian network is proposed. This method abstracts the storage system into two levels, which are divided into two parts, functional unit and storage system as a whole. When evaluating the reliability of functional units, a reliability model based on Z language is established. Since its state transition with respect to time conforms to the properties of the Markov chain, a continuous-time Markov chain is introduced for evaluation. In order to more clearly express the multi-state relationship between the storage system and each functional unit, the functional unit failure rate and The Bayesian network between the overall failure rates of the storage system. The overall reliability of the storage system is calculated based on the Bayesian network, and the key reliability modules are obtained. Finally, through the example analysis and calculation, it is shown that the proposed reliability evaluation method can accurately describe the state transition of the storage system, quantify the reliability of the storage system, and obtain its reliability, which has certain practical value.

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王穎穎,莊毅,孫逸帆.基于Z語(yǔ)言和貝葉斯網(wǎng)絡(luò )的存儲系統可靠性評估方法計算機測量與控制[J].,2022,30(4):249-257.

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  • 收稿日期:2022-01-29
  • 最后修改日期:2022-03-11
  • 錄用日期:2022-02-25
  • 在線(xiàn)發(fā)布日期: 2022-04-21
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