Large data center interconnects employing hybrid optical switching

Fiorani, Matteo; Casoni, Maurizio; Aleksić, Slaviša

doi:10.1109/noc-oci.2013.6582869

Cited by 9 publications

(7 citation statements)

References 12 publications

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“…Extending the work presented in [23], in this paper, we propose a novel data center network based on HOS. The HOS switching paradigm ensures a high network flexibility that we have not found in the solutions proposed so far in the technical literature.…”

Section: Journal Of Electrical and Computer Engineeringmentioning

confidence: 96%

“…In this section we report a brief description of the HOS concept. For a more detailed explanation regarding the HOS data and control plane, we refer the reader to [22,23,26].…”

Section: Hos Transport Mechanismsmentioning

confidence: 99%

“…The shorter offset-times and faster assembly algorithm lead to a higher loss probability and lower delays with respect to long bursts. In [23] we observed that bursts are suited only for delay-insensitive data center applications because of their high latency. Here, we were able to reduce the bursts latency by acting on the thresholds used in the short and long burst assemblers.…”

Section: Hos Transport Mechanismsmentioning

confidence: 99%

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Hybrid Optical Switching for Data Center Networks

Fiorani

Aleksić

Casoni

2014

Journal of Electrical and Computer Engineering

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Current data centers networks rely on electronic switching and point-to-point interconnects. When considering future data center requirements, these solutions will raise issues in terms of flexibility, scalability, performance, and energy consumption. For this reason several optical switched interconnects, which make use of optical switches and wavelength division multiplexing (WDM), have been recently proposed. However, the solutions proposed so far suffer from low flexibility and are not able to provide service differentiation. In this paper we introduce a novel data center network based on hybrid optical switching (HOS). HOS combines optical circuit, burst, and packet switching on the same network. In this way different data center applications can be mapped to the optical transport mechanism that best suits their traffic characteristics. Furthermore, the proposed HOS network achieves high transmission efficiency and reduced energy consumption by using two parallel optical switches. We consider the architectures of both a traditional data center network and the proposed HOS network and present a combined analytical and simulation approach for their performance and energy consumption evaluation. We demonstrate that the proposed HOS data center network achieves high performance and flexibility while considerably reducing the energy consumption of current solutions.

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Section: Journal Of Electrical and Computer Engineeringmentioning

confidence: 96%

“…In this section we report a brief description of the HOS concept. For a more detailed explanation regarding the HOS data and control plane, we refer the reader to [22,23,26].…”

Section: Hos Transport Mechanismsmentioning

confidence: 99%

Section: Hos Transport Mechanismsmentioning

confidence: 99%

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Hybrid Optical Switching for Data Center Networks

Fiorani

Aleksić

Casoni

2014

Journal of Electrical and Computer Engineering

Self Cite

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“…Every server initially has 80 units of computing resources. The values of the parameters used to calculate the power consumption are summarized in Table 2, according to the previous works in [10,11]. All VN embedding requests are generated with a Poisson traffic model.…”

Section: Simulation Settingmentioning

confidence: 99%

Virtual network embedding for power savings of servers and switches in elastic data center networks

Hou

Wei

2016

Sci. China Inf. Sci.

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Currently, the elastic interconnection has realized the high-rate data transmission among data centers (DCs). Thus, the elastic data center network (EDCN) emerged. In EDCNs, it is essential to achieve the virtual network (VN) embedding, which includes two main components: VM (virtual machine) mapping and VL (virtual link) mapping. In VM mapping, we allocate appropriate servers to hold VMs. While for VL mapping, an optimal substrate path is determined for each virtual lightpath. For the VN embedding in EDCNs, the power efficiency is a significant concern, and some solutions were proposed through sleeping light-duty servers. However, the increasing communication traffic between VMs leads to a serious energy dissipation problem, since it also consumes a great amount of energy on switches even utilizing the energy-efficient optical transmission technique. In this paper, considering load balancing and power-efficient VN embedding, we formulate the problem and design a novel heuristic for EDCNs, with the objective to achieve the power savings of servers and switches. In our solution, VMs are mapped into a single DC or multiple DCs with the short distance between each other, and the servers in the same cluster or adjacent clusters are preferred to hold VMs. Such that, a large amount of servers and switches will become vacant and can go into sleep mode. Simulation results demonstrate that our method performs well in terms of power savings and load balancing. Compared with benchmarks, the improvement ratio of power efficiency is 5%-13%.

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“…Amidst these challenges, several DCN architectures have been investigated tailored to the capabilities and limitations of the most prominent optical switching technologies, such as micro-electro-mechanical systems (MEMS) 5,6 , semiconductor optical amplifier (SOA) switches 7,8 , tunable lasers combined with arrayed-waveguide-grating routers (AWGRs) 9,10 and wavelength-selective switches (WSSs) 11,12 . These works have proven the concept of optical switching for datacenters, yet several open issues remain as to the scalability of these architectures for serving a large number of hosts.…”

Section: Introductionmentioning

confidence: 99%

Optical datacenter network employing slotted (TDMA) operation for dynamic resource allocation

Bakopoulos

Tokas

Spatharakis

et al. 2018

Optical Interconnects XVIII

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The soaring traffic demands in datacenter networks (DCNs) are outpacing progresses in CMOS technology, challenging the bandwidth and energy scalability of currently established technologies. Optical switching is gaining traction as a promising path for sustaining the explosive growth of DCNs; however, its practical deployment necessitates extensive modifications to the network architecture and operation, tailored to the technological particularities of optical switches (i.e. no buffering, limitations in radix size and speed). European project NEPHELE is developing an optical network infrastructure that leverages optical switching within a software-defined networking (SDN) framework to overcome the bandwidth and energy scaling challenges of datacenter networks. An experimental validation of the NEPHELE data plane is reported based on commercial off-the-shelf optical components controlled by FPGA boards. To facilitate dynamic allocation of the network resources and perform collision-free routing in a lossless network environment, slotted operation is employed (i.e. using time-division multiple-access-TDMA). Error-free operation of the NEPHELE data plane is verified for 200 μs slots in various scenarios that involve communication between Ethernet hosts connected to custom-designed top-of-rack (ToR) switches, located in the same or in different datacenter pods. Control of the slotted data plane is obtained through an SDN framework comprising an OpenDaylight controller with appropriate add-ons. Communication between servers in the optical-ToR is demonstrated with various routing scenarios, concerning communication between hosts located in the same rack or in different racks, within the same or different datacenter pods. Error-free operation is confirmed for all evaluated scenarios, underpinning the feasibility of the NEPHELE architecture.

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Large data center interconnects employing hybrid optical switching

Cited by 9 publications

References 12 publications

Hybrid Optical Switching for Data Center Networks

Hybrid Optical Switching for Data Center Networks

Virtual network embedding for power savings of servers and switches in elastic data center networks

Optical datacenter network employing slotted (TDMA) operation for dynamic resource allocation

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