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Portland. J. K. Kim. Trend of Data Center. By J. Nicholas Hoover , InformationWeek June 17, 2008 04:00 AM. 200 million Euro. http://gigaom.com/cloud/google-builds-megadata-center-in-finland/. http://www.datacenterknowledge.com.
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Portland J. K. Kim
Trend of Data Center By J. Nicholas Hoover , InformationWeek June 17, 2008 04:00 AM 200 million Euro http://gigaom.com/cloud/google-builds-megadata-center-in-finland/ http://www.datacenterknowledge.com • Data centers will be larger and larger in the future cloud computing era to benefit from commodities of scale. • Tens of thousand Hundreds of thousands in # of servers • Most important things in data center management • Commodities of scale • Keep High utilization of their expensive equipment • Maximize revenue • Saving administration cost • Low power consumption (http://www.energystar.gov/ia/partners/prod_development/downloads/EPA_Datacenter_Report_Congress_Final1.pdf)
Requirements for future data center • To catch up with the trend of mega data center, DCN technology should meet the requirements as below • High Scalability • Transparent VM migration (high agility) • Easy deployment requiring less human administration • Efficient communication • Loop free forwarding • Fault Tolerant • Current DCN technology can’t meet the requirements. • Layer 3 protocol can not support the transparent VM migration. • Current Layer 2 protocol is not scalable due to the size of forwarding table and native broadcasting for address resolution.
Overall Idea of PortLand Add a new host • Key features • Layer 2 protocol based on tree topology • PMAC encode the position information • Data forwarding proceeds based on PMAC • Edge switch’s responsible for mapping between PMAC and AMAC • Fabric manger’s responsible for address resolution • Edge switch makes PMAC invisible to end host • Each switch node can identify its position by itself • Fabric manager keep information of overall topology. Corresponding to the fault, it notifies affected nodes. Transfer a packet
Questions in discussion board • Question about Fabric Manager • How to make Fabric Manager robust ? • How to build scalable Fabric Manager ? Redundant deployment or cluster Fabric manager could be solution • Question about reality of base-line tree topology • Is the tree topology common in real world ? Yes, multi-rooted tree topology has been a traditional topology in data center. [A scalable, commodity data center network architecture Mohammad La-Fares and et el, SIGCOMM ‘08]
Discussion points • Is the PortLand applicable to other topology ? The Idea of central ARP management could be applicable. To solve forwarding loop problem, TRILL header-like method would be necessary. The benefits of PMAC ? It would require larger size of forwarding table. • Question about benefits from VM migration • VM migration helps to reduce traffic going through aggregate/core switches. • How about user requirement change? • How about power consumption ? • ETC • Feasibility to mimic PortLand on layer 3 protocol. • How about using pseudo IP ? • Delay to boot up whole data center