Service‐level assurance in high‐availability multi‐unit systems using the M‐for‐N backup scheme

Ozaki, Hirokazu; Kara, A.; Cheng, Zixue

doi:10.1002/qre.1179

Cited by 5 publications

(4 citation statements)

References 15 publications

(16 reference statements)

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“…Namely, we compute the availability by using the relations, which correspond to (2)(3)(4) in the case of prioritized protection switching. Consider a group N j ð1 , j # kÞ.…”

Section: Ijqrm 281mentioning

confidence: 99%

User‐perceived availability of priority shared protection systems

Ozaki

Kara

Cheng

2011

International Journal of Quality &Amp; Reliability Management

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PurposeThe purpose of this paper is to derive the user‐perceived availability of M‐for‐N shared protection systems composed of multiple user groups, each with a protection‐switching priority.Design/methodology/approachThe paper assumes a shared protection system with M protection units and N working units. The memoryless state transition diagram viewed from the system administrator, combined with combinatorial analysis of state probabilities on protection switching, yields a generic formula of the availability viewed from an arbitrary end user.FindingsThe numerical examples of availability reveal the effect of prioritized protection switching. It is observed that the total protection capacity is constant regardless of the ways of priority grouping. The shared protection system with multiple protection units enables more flexible availability allocation compared with the case of a single protection unit.Research limitations/implicationsUser‐perceived reliability is still an unexplored research area. Many variations of the system treated in this paper can be applied to various applications.Practical implicationsThe analysis provides useful information for the design and operation of, for example, telecommunication network devices. The analysis is applicable to general shared protection systems that are subject to service level agreement (SLA) involving user‐perceived reliability measures.Originality/valueThis paper establishes the model of the priority shared protection systems for the first time and shows a practical computation method of prioritized user‐perceived availability.

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“…Namely, we compute the availability by using the relations, which correspond to (2)(3)(4) in the case of prioritized protection switching. Consider a group N j ð1 , j # kÞ.…”

Section: Ijqrm 281mentioning

confidence: 99%

User‐perceived availability of priority shared protection systems

Ozaki

Kara

Cheng

2011

International Journal of Quality &Amp; Reliability Management

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“…In many real‐life situations, a system consists of a variety of different multi‐state sub‐systems (units) . If several multi‐state units share their performance to meet the common demand, the cumulative performance distribution is evaluated and the entire system is considered to be a multi‐state system consisting of parallel units . For some other systems consisting of many units, each unit must satisfy its individual demand.…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3] If several multi-state units share their performance to meet the common demand, the cumulative performance distribution is evaluated and the entire system is considered to be a multi-state system consisting of parallel units. [4][5][6][7][8] For some other systems consisting of many units, each unit must satisfy its individual demand. If the individual demand is satisfied, the surplus performance can be shared with other units.…”

Section: Introductionmentioning

confidence: 99%

A Study of Reliability of Multi‐State Systems with Two Performance Sharing Groups

Peng

Liu

Xie

2016

Quality & Reliability Eng

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The performance sharing can be widely seen in different kinds of engineering systems, such as meshed power distribution systems and interconnected data transmission systems. This paper presents a study of systems consisting of multi‐state units connected as two performance sharing groups, and the suggested methodology can be adapted for the case of three or more performance sharing groups. To be more general, the system unit is allowed to be in one single performance sharing group or both. Each unit has a random demand to satisfy, and the units can transmit capacity with each other given that the total performance transmitted in each performance sharing group does not surpass its maximum transmission capacity. An algorithm based on the universal generating function technique is proposed to evaluate the system reliability and the expected system performance deficiency. Copyright © 2016 John Wiley & Sons, Ltd.

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“…o define performance standards for network operations, management, and engineering, a service level agreement (SLA) [31] is often employed. An SLA is used in contracts between Internet service providers and their customers.…”

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confidence: 99%