Survivability and Fault Tolerance in the Cloud

From virtual reality and telepresence, to augmented reality, holoportation, and remotely controlled robotics, these future network applications promise an unprecedented development for society, economics and culture by revolutionizing the way we live, learn, work and play. In order to deploy such futuristic applications and to cater to their performance requirements, recent trends stressed the need for the "Tactile Internet", an Internet that, according to the International Telecommunication Union (ITU), combines ultra low latency with extremely high availability, reliability and security [1]. Unfortunately, todays Internet falls short when it comes to providing such stringent requirements due to several fundamental limitations in the design of the current network architecture and communication protocols. This brings the need to rethink the network architecture and protocols, and efficiently harness recent technological advances in terms of virtualization and network softwarization to design the Tactile Internet of the future.In this paper, we start by analyzing the characteristics and requirements of future networking applications. We then highlight the limitations of the traditional network architecture and protocols and their inability to cater to these requirements. Afterward, we put forward a novel network architecture adapted to the Tactile Internet called FlexNGIA, a Flexible Next-Generation Internet Architecture 1 . We then describe some use-cases where we discuss the potential mechanisms and control loops that could be offered by FlexNGIA in order to ensure the required performance and reliability guarantees for future applications. Finally, we identify the key research challenges to further develop FlexNGIA towards a full-fledged architecture for the future Tactile Internet.

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“…They can be either proactive or reactive [42], [38], [43], [44], [45], [46]. Proactive techniques aim at addressing failures before they happen.…”

Section: E Fault-tolerance and Failure Managementmentioning

confidence: 99%

FlexNGIA: A Flexible Internet Architecture for the Next-Generation Tactile Internet

Zhani

Elbakoury

2020

J Netw Syst Manage

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“…Multi-tenancy allows multiple users to share the same infrastructure and hence requires resource isolation between different service chains and better performance management to satisfy each tenant's requirements. The orchestrator needs also to ensure high service chain availability through efficient fault-management (e.g., [175,123,174]). This requires leveraging SDN and NFV technologies to put forward a set of solutions allowing to handle different types of failures (e.g., node, link and software failures) and mitigate their impact on service chain availability.…”

Section: Ii3 Programmable Networkmentioning

confidence: 99%

Research challenges in nextgen service orchestration

Vaquero

Cuadrado

Elkhatib

et al. 2019

Future Generation Computer Systems

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Fog/edge computing, function as a service, and programmable infrastructures, like software-defined networking or network function virtualisation, are becoming ubiquitously used in modern Information Technology infrastructures. These technologies change the characteristics and capabilities of the underlying computational substrate where services run (e.g. higher volatility, scarcer computational power, or programmability). As a consequence, the nature of the services that can be run on them changes too (smaller codebases, more fragmented state, etc.). These changes bring new requirements for service orchestrators, which need to evolve so as to support new scenarios where a close interaction between service and infrastructure becomes essential to deliver a seamless user experience. Here, we present the challenges brought forward by this new breed of technologies and where current orchestration techniques stand with regards to the new challenges. We also present a set of promising technologies that can help tame this brave new world.

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“…Existing literature contains a large array of proposals to manage failures and mitigate their impact in order to ensure service chains' survivability [2]. Previous work proposed to proactively allocate backups for VNFs so that they can take over when a failure occurs [3], [4].…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, we further investigate this solution. However, unlike previous work [2]- [4], we propose novel solutions that (1) decide on the number and the placement of the shared backups and (2) leverage VNF migration (i.e., the migration of the virtual machine or container hosting the network function) to relocate the VNFs in order to minimize the number of shared VNF backups.…”

Section: Introductionmentioning

confidence: 99%

On Optimizing Backup Sharing Through Efficient VNF Migration

Aidi

Zhani

Elkhatib

2019

2019 IEEE Conference on Network Softwarization (NetSoft)

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With the emergence of software defined networking and network function virtualization technologies, network services are expected to be offered as service function chains made out from virtual network functions that are connected to steer and process the incoming traffic. In this context, achieving the survivability of these chains against failures is a key challenge to ensure high availability and continuity of the services. A promising solution proposed in the literature is to provision backups for the virtual network functions that could be shared among multiple service chains. These backups are used in case of a failure to take over the failed functions and ensure service continuity. In this paper, we propose two solutions to efficiently place and provision the shared backups in order to ensure the survivability of the service chains against single node failures. The originality of these solutions is that they leverage the migration of virtual network functions to minimize the resources consumed by the backups. Simulation results show that, compared to existing solutions, the proposed schemes leveraging migration are able to reduce by up to 20% the amount of resources allocated for the shared backups while ensuring the survivability of the service chains .

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Survivability and Fault Tolerance in the Cloud

Cited by 8 publications

References 13 publications

FlexNGIA: A Flexible Internet Architecture for the Next-Generation Tactile Internet

FlexNGIA: A Flexible Internet Architecture for the Next-Generation Tactile Internet

Research challenges in nextgen service orchestration

On Optimizing Backup Sharing Through Efficient VNF Migration

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