A Network Topology for Composable Infrastructures

Ajibola, Opeyemi O.; El-Gorashi, Taisir E. H.; Elmirghani, Jaafar M. H.

doi:10.1109/icton51198.2020.9203275

Cited by 2 publications

(2 citation statements)

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“…Furthermore, the electrical-optical variant of the proposed topology strategically utilizes electrical switches to minimize network power consumption and to maximize network utilization. This paper extends our initial work in [18] in the following ways: 1) A brief review of network topologies proposed for composable DCs is made. 2) Use of semiconductor-optical-amplifiers (SOA) based optical switches in a new configuration eliminates the need for optical filters in the proposed network topology.…”

Section: Introductionmentioning

confidence: 76%

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Network Topologies for Composable Data Centers

Ajibola¹,

El-Gorashi

Elmirghani

2021

IEEE Access

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Suitable composable data center networks (DCNs) are essential to support the disaggregation of compute components in highly efficient next generation data centers (DCs). However, designing such composable DCNs can be challenging. A composable DCN that adopts a full mesh backplane between disaggregated compute components within a rack and employs dedicated interfaces on each point-to-point link is wasteful and expensive. In this paper, we propose and describe two (i.e., electrical, and electricaloptical) variants of a network for composable DC (NetCoD). NetCoD adopts a targeted design to reduce the number of transceivers required when a mesh physical backplane is deployed between disaggregated compute components in the same rack. The targeted design leverages optical communication techniques and components to achieve this with minimal or no network performance degradation. We formulate a MILP model to evaluate the performance of both variants of NetCoD in rack-scale composable DCs that implement different forms of disaggregation. The electrical-optical variant of NetCoD achieves similar performance as a reference network while utilizing fewer transceivers per compute node. The targeted adoption of optical technologies by both variants of NetCoD achieves greater (4 -5 times greater) utilization of available network throughput than the reference network which implements a generic design. Under the various forms of disaggregation considered, both variant of NetCoD achieve near-optimal compute energy efficiency in the composable DC while satisfying both compute and network constraints. This is because marginal concession of optimal compute energy efficiency is often required to achieve overall optimal energy efficiency in composable DCs. INDEX TERMSComposable data centers, disaggregated data centers, energy efficient networks, data center networks, MILP, optical communication, wavelength division multiplexing, optical routing networks, silicon photonic.

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Section: Introductionmentioning

confidence: 76%

“…Constraint (18) enforces flow conservation in the physical network topology between all nodes in the DC.…”

Section: Setsmentioning

confidence: 99%