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Enhancing Wide-Area Distributed Storage with MPTCP and SDN Strategies

Distributed storage systems often struggle to utilize available bandwidth effectively across wide-area networks (WANs) due to single-route limitations. Conventional configurations can lead to issues like packet ordering and unequal link utilization. Our approach combines Software Defined Networking (SDN) to create an overlay network with Multipath TCP (MPTCP) to leverage multiple routes for data transfer. We expect that this will significantly improve data rates without extensive modifications to application layers, ultimately optimizing storage performance in diverse network conditions.

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Enhancing Wide-Area Distributed Storage with MPTCP and SDN Strategies

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  1. Wide-Area Distributed Storage Acceleration using MPTCP ChawanatNakasan, NAISTLightning Talk @ PRAGMA 26Tainan, Taiwan

  2. Distributed Storage doesn’t function well when distributed over wide area. Only one route is used at a time (per high-level connection)* Intermediate network (routers, switches, etc) Storage node Storage node Perfectly fine but unused route * Of course it depends on other configuration as well

  3. Unequal links in WAN prevents use of low-layer load balancing … Packet 2 fast route Packet 1 slow route

  4. … due to problems like packet ordering. fast route Packet 2 Packet 1 slow route There are other problems too.

  5. We plan to use SDN to create an overlay network. Overlay Network Physical Network

  6. Then, use MPTCP to span the data transfer to multiple routes. Packet 2 Packet 2 Packet 1 Packet 1

  7. We expect: that we can use more routes thanks to SDN that in the end, MPTCP can increase data rate

  8. and: that we shouldn’t have to modify anything else too much. Especially the Application. Application Transport MPTCP TCP Subflow TCP Subflow TCP Subflow SDN Network Data Link

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