Disaggregated Data Centers: Challenges and Trade-offs
Disaggregated Data Centers: Challenges and Trade-offs
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分类数据中心：挑战与权衡
DOI：
10.1109/mcom.001.1900612
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发表时间：
2020
影响因子：
11.2
通讯作者：
Jiajia Chen
中科院分区：
文献类型：
--
作者：
Rui Lin;Yuxin Cheng;M. D. Andrade;L. Wosinska;Jiajia Chen
分布式数据中心可以为资源分配提供高度的灵活性；因此，它们的资源利用率可以显著提高。然而，在完全分解的数据中心中，不同类型资源之间的通信，特别是CPU和内存之间的通信，由于对超低延迟和超高传输带宽的严格要求，面临着严峻的问题。光纤通信有望提供高容量和低延迟，但最先进的光技术仍然难以满足完全分解的数据中心的要求。本文研究了不同程度的资源分解。对于完全分解的数据中心，提出了两种架构选择，其中cpu -内存通信需要光互连。我们回顾了最新的光传输和交换技术，并分析了它们在分解数据中心中的适用性的优缺点。结果表明，资源分解确实提高了数据中心的资源利用率。但是，最先进的技术所提供的带宽并不总是足以满足完全分解的数据中心。它要求光通信技术的进一步发展，以充分利用完全分解的数据中心的优势。
Disaggregated data centers (DCs) can offer high flexibility for resource allocation; hence, their resource utilization can be significantly improved. However, communications between different types of resources, in particular between CPU and memory, in fully disaggregated DCs face severe problems in terms of stringent requirements for ultra-low latency and ultra-high transmission bandwidth. Optical fiber communication is promising to provide high capacity and low latency, but it is still challenging for the state-of-the-art optical technologies to meet the requirements of fully disaggregated DCs. In this article, different levels of resource disaggregation are investigated. For fully disaggregated DCs, two architectural options are presented, where optical interconnects are necessary for the CPU-memory communications. We review the state-of-the-art optical transmission and switching technologies, and analyze pros and cons of their applicability in the disaggregated DCs. The results reveal that resource disaggregation does improve the resource utilization in DCs. However, the bandwidth provided by the state-of-the-art technologies is not always sufficient for fully disaggregated DCs. It calls for further advances in optical communications to fully utilize the advantages of fully disaggregated DCs.