PortlandTrend of Data CenterRequirements for future data centerOverall Idea of PortLandQuestions in discussion boardDiscussion pointsJ. K. KimPortlandTrend of Data CenterBy J. Nicholas Hoover , InformationWeek June 17, 2008 04:00 AM 200 million EuroData 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 serversMost 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)http://gigaom.com/cloud/google-builds-megadata-center-in-finland/http://www.datacenterknowledge.comRequirements for future data centerTo catch up with the trend of mega data center, DCN technology should meet the requirements as belowHigh ScalabilityTransparent VM migration (high agility)Easy deployment requiring less human administrationEfficient communicationLoop free forwardingFault 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 PortLandAdd a new hostTransfer a packetKey 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.Questions in discussion boardQuestion about Fabric Manager oHow to make Fabric Manager robust ?oHow to build scalable Fabric Manager ? Redundant deployment or cluster Fabric manager could be solution Question about reality of base-line tree topologyoIs 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 pointsoIs 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 migrationoVM migration helps to reduce traffic going through aggregate/core switches.oHow about user requirement change?oHow about power consumption ?ETCoFeasibility to mimic PortLand on layer 3 protocol.oHow about using pseudo IP ?oDelay to boot up whole data
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